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A122451
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A diagonal above central terms of pendular trinomial triangle A122445, ignoring leading zeros.
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7
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1, 4, 17, 72, 305, 1300, 5576, 24068, 104510, 456332, 2002675, 8829892, 39096653, 173781548, 775183764, 3469084436, 15571135682, 70084045640, 316242702258, 1430351652352, 6483550388522, 29448610671464, 134010580021152
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| G.f.: A(x) = B(x)^2*(B(x)-1)/(x*(1+x - x*B(x))) where B(x) is the g.f. of A122446.
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PROG
| (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^2*(B-1)/x/(1+x-x*B); polcoeff(A, n, x)}
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CROSSREFS
| Cf. A122445, A122446, A122447, A122448, A122449, A122450, A122452.
Sequence in context: A108929 A022031 A001076 * A113442 A085732 A083330
Adjacent sequences: A122448 A122449 A122450 * A122452 A122453 A122454
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Sep 07 2006
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