id:A122050 - OEIS Search Results

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A122050

An n-th level recursion:a(n) = (n-1)a(n - 1) - a(n - 4).

+0
1

0, 1, 2, 1, 3, 11, 53, 317, 2216, 17717, 159400, 1593683, 17528297, 210321847, 2734024611, 38274750871, 574103734768, 9185449434441, 156149906360886, 2810660039745077, 53401966651421695, 1068030147578999459 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n) = (n-1)a(n - 1) -a(n - 4)`
	MATHEMATICA	`a[0] = 0; a[1] = 1; a[2] = 2; a[3] = 1; a[n_] := a[n] = (n - 1)*a[n - 1] - a[n - 4] Table[a[n], {n, 0, 30}]`
	CROSSREFS	`Cf. A122022.` `Sequence in context: A091858 A070165 A119928 this_sequence A081323 A007447 A153189` `Adjacent sequences: A122047 A122048 A122049 this_sequence A122051 A122052 A122053`
	KEYWORD	`nonn`
	AUTHOR	`Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 13 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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