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Search: id:A122450
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| A122450 |
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Diagonal above central terms of pendular trinomial triangle A122445, ignoring leading zeros. |
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+0
8
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| 1, 3, 12, 47, 189, 773, 3208, 13478, 57222, 245134, 1058348, 4600571, 20118753, 88450897, 390721560, 1733348234, 7719287578, 34497374034, 154659735720, 695397289078, 3135087583426, 14168892518258, 64181607367952
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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G.f.: A(x) = B(x)*(B(x)-1)/(x*(1+x - x*B(x))) where B(x) is the g.f. of A122446.
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PROGRAM
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(PARI) {a(n)=local(A, B=2/(1+2*x^2+sqrt(1-4*x-4*x^2+4*x^4+x^2*O(x^n)))); A=B*(B-1)/x/(1+x-x*B); polcoeff(A, n, x)}
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CROSSREFS
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Cf. A122445, A122446, A122447, A122448, A122449, A122451, A122452.
Sequence in context: A108368 A077829 A088132 this_sequence A100389 A064562 A077828
Adjacent sequences: A122447 A122448 A122449 this_sequence A122451 A122452 A122453
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Sep 07 2006
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