id:A106272 - OEIS Search Results

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Diagonal sums of number triangle A106270.

+0
2

1, -1, -1, -6, -15, -48, -147, -477, -1577, -5339, -18373, -64125, -226385, -807025, -2900825, -10501870, -38258495, -140146660, -515897195, -1907409850, -7080017615, -26373676870, -98562581255, -369433290520, -1388466728579, -5231379691972 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`G.f.: c(x)sqrt(1-4x)/(1-x^2), c(x) the g.f. of A000108; a(n)=sum{k=0..floor(n/2), 2*0^(n-2k)-C(n-2k)}.`
	CROSSREFS	`Sequence in context: A117961 A095122 A082637 this_sequence A056423 A056347 A122365` `Adjacent sequences: A106269 A106270 A106271 this_sequence A106273 A106274 A106275`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 28 2005`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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