id:A088675 - OEIS Search Results

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Eigenfunction of a sequence transformation.

+0
1

0, 1, -2, 8, -36, 160, -656, 2368, -7664, 29440, -184896, 1174272, -3395200, -21222400, 178961920, 1638189056, -27449296640, -28875071488, 3234263731200, -10138343231488, -422012179953664, 3426627065331712, 59293997091528704 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`G.f. A(x) satisfies x=(1+4*A(x))A(A(x)).`
	PROGRAM	`(PARI) a(n)=local(A); if(n<1, 0, A=x; for(k=1, n, A=Pol(A+serreverse(A+xO(x^k))/(1+4x))/2); polcoeff(A, n))`
	CROSSREFS	`Sequence in context: A122674 A076122 A123290 this_sequence A027743 A147722 A089387` `Adjacent sequences: A088672 A088673 A088674 this_sequence A088676 A088677 A088678`
	KEYWORD	`sign`
	AUTHOR	`Michael Somos, Oct 04 2003`

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

AT&T Labs Research