A107588 G.f. satisfies: A(x) = 1 + ( x/A(x) )/A( x/A(x) ).

1, 1, -2, 8, -42, 258, -1764, 13070, -103262, 860812, -7516306, 68380986, -645635800, 6307334042, -63602862362, 660771763808, -7061440267362, 77524521343282, -873398761544252, 10087973928531918, -119358929179189278, 1445596845096459108, -17909930113246116338

Offset

0,3

Links

Table of n, a(n) for n=0..22.

Formula

G.f.: A(x) = 1/G088714(-x), where G088714(x) is the g.f. of A088714.

Prog

(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(k=1, n, A=1+subst(x/A, x, x/A)); polcoeff(A, n)}

Crossrefs

Cf. A088714.

Sequence in context: A235350 A100327 A018934 * A013999 A130649 A054993

Adjacent sequences: A107585 A107586 A107587 * A107589 A107590 A107591

Keyword

sign

Author

Paul D. Hanna, May 17 2005

Status

approved