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Search: id:A038220
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| A038220 |
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Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*2^j. |
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6
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| 1, 3, 2, 9, 12, 4, 27, 54, 36, 8, 81, 216, 216, 96, 16, 243, 810, 1080, 720, 240, 32, 729, 2916, 4860, 4320, 2160, 576, 64, 2187, 10206, 20412, 22680, 15120, 6048, 1344, 128, 6561, 34992, 81648, 108864, 90720, 48384, 16128, 3072, 256
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums give A000351; central terms give A119309. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 14 2006
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REFERENCES
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B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
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LINKS
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Index entries for triangles and arrays related to Pascal's triangle
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FORMULA
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T(n,k) = A007318(n,k) * A036561(n,k). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 14 2006
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CROSSREFS
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Cf. A013620, A000079, A000244, A013613.
Sequence in context: A010372 A152049 A099887 this_sequence A053151 A053088 A077898
Adjacent sequences: A038217 A038218 A038219 this_sequence A038221 A038222 A038223
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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