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A123358
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Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).
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2
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1, 10, 125, 1625, 21250, 278125, 3640625, 47656250, 623828125, 8166015625, 106894531250, 1399267578125, 18316650390625, 239768066406250, 3138604736328125, 41084869384765625, 537807922363281250, 7039997100830078125, 92154758453369140625, 1206321449279785156250, 15790952777862548828125, 206706255435943603515625
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: -(5*x-1) / (25*x^2-15*x+1). - Colin Barker, Aug 29 2013
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MAPLE
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option remember;
if n <= 1 then
op(n+1, [1, 10]) ;
else
15*procname(n-1)-25*procname(n-2) ;
end if
end proc:
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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