id:A143126 - OEIS Search Results

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a(n)=(1-2n)*2^n.

+0
2

1, -2, -12, -40, -112, -288, -704, -1664, -3840, -8704, -19456, -43008, -94208, -204800, -442368, -950272, -2031616, -4325376, -9175040, -19398656, -40894464, -85983232, -180355072, -377487360, -788529152, -1644167168 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Hankel transform of abs(A002420) (which 2*0^n-binomial(2n,n)/(2n-1)).`
	FORMULA	`G.f.: (1-6x)/(1-2x)^2;` `a(n)=Sum_{k, 0<=k<=n} A121314(n,k)(-1)^k2^(3n-2k). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 31 2008]`
	CROSSREFS	`Cf. A118417.` `Sequence in context: A008911 A005719 A118417 this_sequence A069144 A013194 A074447` `Adjacent sequences: A143123 A143124 A143125 this_sequence A143127 A143128 A143129`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 26 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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