Search: id:A108645
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%I A108645
%S A108645 1,26,250,1435,5978,19992,56952,143550,328515,695266,1379378,2591953,
%T A108645 4650100,8015840,13344864,21546684,33857829,51929850,77934010,114684647,
%U A108645 165783310,235785880,330395000,456680250,623328615,840927906,1122285906
%N A108645 (n+1)(n+2)^2*(n+3)^2*(n+4)(2n^2+6n+5)/720.
%C A108645 Kekule numbers for certain benzenoids.
%D A108645 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).
%p A108645 a:=(n+1)*(n+2)^2*(n+3)^2*(n+4)*(2*n^2+6*n+5)/720: seq(a(n),n=0..30);
%Y A108645 Sequence in context: A020537 A088889 A060105 this_sequence A086023 A125389 
               A109467
%Y A108645 Adjacent sequences: A108642 A108643 A108644 this_sequence A108646 A108647 
               A108648
%K A108645 nonn
%O A108645 0,2
%A A108645 Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 13 2005

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