A099021 - OEIS

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A099021

Main diagonal of array in A099020.

1, 1, 4, 24, 198, 2070, 26160, 387240, 6565020, 125341020, 2659925520, 62089917120, 1580632348680, 43571319671880, 1292731109429760, 41068078953501600, 1390717740470058000, 50003952605673066000 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`Diagonal of Euler-Seidel matrix with start sequence A001147.`
	FORMULA	`a(n)=(1/(sqrt(2pi)))Int(exp(-x^2/2)*(x(1+x))^n,x,-infinity,infinity). [From Paul Barry (pbarry(AT)wit.ie), Apr 19 2010]`
	CROSSREFS	`Sequence in context: A007145 A101370 A201338 * A136229 A138419 A089946` `Adjacent sequences: A099018 A099019 A099020 * A099022 A099023 A099024`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Sep 23 2004`

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Last modified February 16 08:13 EST 2012. Contains 205893 sequences.