id:A026134 - OEIS Search Results

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Sum{T(k,k-1)}, k = 1,2,...,n, where T is the array in A026120.

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4

1, 2, 6, 16, 44, 120, 329, 904, 2493, 6898, 19151, 53340, 149019, 417522, 1172979, 3303696, 9326931, 26390070, 74824584, 212565864, 604972998, 1724739940, 4925066567, 14085122376, 40339596735, 115688495806, 332203673142 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`G.f.: z(1-z)M^3, with M the g.f. of the Motzkin numbers (A001006).`
	CROSSREFS	`T(n, n+2), where T is given by A026148, T(n, n-2), where T is the array defined in A026105 and T(n, n+1), where T is given by A026323.` `First differences of A005322.` `Cf. A026123.` `Sequence in context: A118041 A105073 A002605 this_sequence A105696 A074413 A055544` `Adjacent sequences: A026131 A026132 A026133 this_sequence A026135 A026136 A026137`
	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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