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Search: id:A108645
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| A108645 |
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(n+1)(n+2)^2*(n+3)^2*(n+4)(2n^2+6n+5)/720. |
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+0
1
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| 1, 26, 250, 1435, 5978, 19992, 56952, 143550, 328515, 695266, 1379378, 2591953, 4650100, 8015840, 13344864, 21546684, 33857829, 51929850, 77934010, 114684647, 165783310, 235785880, 330395000, 456680250, 623328615, 840927906, 1122285906
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OFFSET
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0,2
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COMMENT
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Kekule numbers for certain benzenoids.
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REFERENCES
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S. J. Cyvin and I. Gutman, Kekule structures in benzenoid hydrocarbons, Lecture Notes in Chemistry, No. 46, Springer, New York, 1988 (p.230, no. 21).
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MAPLE
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a:=(n+1)*(n+2)^2*(n+3)^2*(n+4)*(2*n^2+6*n+5)/720: seq(a(n), n=0..30);
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CROSSREFS
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Sequence in context: A020537 A088889 A060105 this_sequence A086023 A125389 A109467
Adjacent sequences: A108642 A108643 A108644 this_sequence A108646 A108647 A108648
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KEYWORD
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nonn
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AUTHOR
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Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 13 2005
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