id:A026083 - OEIS Search Results

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a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0 = s(n), |s(i) - s(i-1)| = 1 for i = 1,2,3; |s(i) - s(i-1)| <= 1 for i >= 4. Also a(n) = T(n,n), where T is the array defined in A026082.

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6, 12, 38, 104, 300, 856, 2464, 7104, 20550, 59580, 173118, 503960, 1469546, 4291644, 12550290, 36746592, 107712306, 316050372, 928224594, 2728494360, 8026707864, 23630376000, 69614498268, 205212650272, 605292727450, 1786351811556 (list; graph; listen)

	OFFSET	`4,1`
	COMMENT	`Third differences of the central trinomial numbers (A002426). - T. D. Noe (noe(AT)sspectra.com), Mar 16 2005`
	CROSSREFS	`Equals 2 * A024998(n-1). First differences of A024997.` `Sequence in context: A038266 A117596 A096377 this_sequence A128453 A052747 A007121` `Adjacent sequences: A026080 A026081 A026082 this_sequence A026084 A026085 A026086`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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