id:A138240 - OEIS Search Results

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Expansion of (1/4)(1-sqrt(1-12x)/sqrt(1-4x)).

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0, 1, 6, 40, 296, 2400, 20928, 192768, 1848960, 18277888, 184890368, 1904259072, 19898765312, 210424545280, 2247494172672, 24209586782208, 262696649785344, 2868744309571584, 31504024885002240, 347697247933169664 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Hankel transform of a(n) is -4^comb(n,2)A099156(n)=-4^comb(n,2)[x^n](x/(1-8x+4x^2)).` `Hankel transform of a(n+1) is 4^comb(n+1,2)=A053763(n+1).` `Hankel transform of a(n+2) is 4^comb(n+1,2)A102591(n+1)=4^comb(n+1,2)[x^n](6-4x)/(1-8x+4x^2).`
	CROSSREFS	`Cf. A104498.` `Adjacent sequences: A138237 A138238 A138239 this_sequence A138241 A138242 A138243` `Sequence in context: A069720 A005037 A081337 this_sequence A083805 A006387 A014481`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 07 2008`

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.

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