id:A137195 - OEIS Search Results

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Even-indexed coefficients related to Kirchhoff index of hexagonal (benzene) chains.

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1, 6, 19, 64, 185, 542, 1511, 4144, 11329, 29894, 80731, 207696, 556217, 1405566, 3741263, 9328928, 24716353, 60998086, 161022115, 394136864, 1037382905, 2522256670, 6622609463, 16012527312, 41958312193, 100973218566 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Essentially CONV transform of A079496.`
	LINKS	`Yujun Yang, Heping Zhang, Kirchhoff Index of linear hexagonal chains, Int. J. Quant. Chem. 108 (2008) 503-512.`
	FORMULA	`O.g.f.: [(1+3x-x^2-x^3)/(1-6x^2+x^4)]^2. a(n)=12a(n-2)-38a(n-4)+12a(n-6)-a(n-8).`
	CROSSREFS	`Sequence in context: A125069 A080926 A041673 this_sequence A055916 A060579 A100191` `Adjacent sequences: A137192 A137193 A137194 this_sequence A137196 A137197 A137198`
	KEYWORD	`easy,nonn`
	AUTHOR	`R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2008`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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