id:A122048 - OEIS Search Results

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A122048

A alternating n-th level recursion: a(n) = (n - 2)*a(n - 2) - a(n - 3).

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0, 1, 2, 1, 3, 1, 11, 2, 65, 3, 518, -38, 5177, -936, 62162, -17345, 871204, -322337, 13956609, -6350933, 251541299, -134624336, 5037176913, -3078652355, 110952516422, -75846181078, 2665939046483, -2007107043372, 69390261389636, -56857829217527, 1944934425953180 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n) = (n - 2)*a(n - 2) - a(n - 3)`
	MATHEMATICA	`a[0] = 0; a[1] = 1; a[2] = 2; a[n_] := a[n] = (n - 2)*a[n - 2] - a[n - 3] Table[a[n], {n, 0, 30}]`
	CROSSREFS	`Cf. A122021.` `Sequence in context: A126761 A090559 A098570 this_sequence A046208 A006241 A137764` `Adjacent sequences: A122045 A122046 A122047 this_sequence A122049 A122050 A122051`
	KEYWORD	`sign`
	AUTHOR	`Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 13 2006`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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