id:A062112 - OEIS Search Results

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a(0)=0; a(1)=1; a(n) = a(n-1) + (3+(-1)^n)*a(n-2)/2

+0
3

0, 1, 1, 2, 4, 6, 14, 20, 48, 68, 164, 232, 560, 792, 1912, 2704, 6528, 9232, 22288, 31520, 76096, 107616, 259808, 367424, 887040, 1254464, 3028544, 4283008, 10340096, 14623104, 35303296, 49926400, 120532992, 170459392, 411525376 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`G.f.: x(1+x-2x^2)/(1-4x^2+2x^4).`
	EXAMPLE	`a(4) = a(3) + 2* a(2) = 2+ 2 = 4`
	CROSSREFS	`A007068.` `a(2n)=A007070(n+1). a(2n+1)=A006012(n).` `Sequence in context: A095698 A064409 A032353 this_sequence A084685 A058059 A053686` `Adjacent sequences: A062109 A062110 A062111 this_sequence A062113 A062114 A062115`
	KEYWORD	`easy,nonn`
	AUTHOR	`Olivier Gerard (ogerard(AT)ext.jussieu.fr), Jun 05 2001`

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

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