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Search: id:A054498
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| A054498 |
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Number of symmetric nonnegative integer 8 X 8 matrices with sum of elements equal to 4*n, under action of dihedral group D_4. |
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1
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| 1, 4, 16, 44, 116, 260, 560, 1100, 2090, 3740, 6512, 10868, 17732, 28028, 43472, 65780, 97955, 143000, 205920, 291720, 408408, 563992, 770848, 1041352, 1394068, 1847560, 2428960, 3165400, 4095640, 5258440, 6708064, 8498776, 10705189
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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Y. Teranishi, Linear Diophantine equations and invriant theory of matrices, in Commutative algebra and combinatorics (Kyoto, 1985), pp. 259-275, Adv. Stud. Pure Math., 11, North-Holland, Amsterdam, 1987. (See p. 273.)
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FORMULA
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G.f.: 1/((1-x)^4*(1-x^2)^6).
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CROSSREFS
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Cf. A001753, A038163.
Sequence in context: A034131 A161142 A018210 this_sequence A134139 A097125 A159940
Adjacent sequences: A054495 A054496 A054497 this_sequence A054499 A054500 A054501
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KEYWORD
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easy,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), May 14 2000
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