A118439 Column 0 of triangle A118438.

1, -1, 5, 11, -23, -41, 45, -29, 337, 1199, -3115, -6469, 10297, 8839, 16125, 108691, -354143, -873121, 1721765, 2521451, -1476983, 6699319, -34182195, -103232189, 242017777, 451910159, -597551755, -130656229, -2465133863, -10513816601, 29729597085, 66349305331, -116749235903

Offset

0,3

Links

Table of n, a(n) for n=0..32.

Formula

G.f.: (1-x+10*x^2+6*x^3+21*x^4-5*x^5)/(1-x^2)/(1+6*x^2+25*x^4).

Mathematica

LinearRecurrence[{0, -5, 0, -19, 0, 25}, {1, -1, 5, 11, -23, -41}, 33] (* Jean-François Alcover, Apr 08 2024 *)

Prog

(PARI) {a(n)=polcoeff((1-x+10*x^2+6*x^3+21*x^4-5*x^5)/(1-x^2)/(1+6*x^2+25*x^4+x*O(x^n)), n)}

Crossrefs

Cf. A118438 (triangle), A118440 (row sums); A118436 (column 0 of inverse).

Sequence in context: A147081 A046628 A262284 * A343711 A323042 A210731

Adjacent sequences: A118436 A118437 A118438 * A118440 A118441 A118442

Keyword

sign

Author

Paul D. Hanna, Apr 28 2006

Status

approved