A137195 - OEIS

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A137195

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

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; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`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: A184189 A152098 A041673 * A055916 A060579 A183326` `Adjacent sequences: A137192 A137193 A137194 * A137196 A137197 A137198`
	KEYWORD	`easy,nonn`
	AUTHOR	`R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2008`

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.