id:A026027 - OEIS Search Results

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a(n) = number of (s(0), s(1), ..., s(2n-1)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 3, s(2n-1) = 6. Also a(n) = T(2n-1,n-2), where T is defined in A026022.

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1, 5, 21, 84, 329, 1274, 4900, 18768, 71706, 273581, 1043119, 3976700, 15163785, 57848910, 220830360, 843621600, 3225477150, 12342901410, 47274639594, 181230395304, 695384769002, 2670587146260, 10265249568536, 39491671919840 (list; graph; listen)

	OFFSET	`2,2`
	FORMULA	`C(2n-1, n-2) - C(2n-1, n-6). G.f.: (1+x^2C^4)*C^5, where C=(1-sqrt(1-4x))/(2x). - Ralf Stephan, Jan 09 2005`
	CROSSREFS	`Sequence in context: A083319 A146041 A146585 this_sequence A002054 A028948 A002450` `Adjacent sequences: A026024 A026025 A026026 this_sequence A026028 A026029 A026030`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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

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