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Search: id:A026134
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| A026134 |
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Sum{T(k,k-1)}, k = 1,2,...,n, where T is the array in A026120. |
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+0
3
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| 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)
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OFFSET
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1,2
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FORMULA
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G.f.: z(1-z)M^3, with M the g.f. of the Motzkin numbers (A001006).
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CROSSREFS
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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.
Adjacent sequences: A026131 A026132 A026133 this_sequence A026135 A026136 A026137
Sequence in context: A105073 A002605 A080953 this_sequence A105696 A074413 A055544
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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