0,2

G.f.: 1 = Sum_{k>=0} a(k)*x^k*(1-x)^(3 + k*(k-1)/2).

1 = 1*(1-x)^3 + 3*x*(1-x)^3 + 6*x^2*(1-x)^4 +

16*x^3*(1-x)^6 + 63*x^4*(1-x)^9 + 351*x^5*(1-x)^13 +...

(PARI) {a(n)=polcoeff(1-sum(k=0, n-1, a(k)*x^k*(1-x+x*O(x^n))^(3+k*(k-1)/2)), n)}

Cf. A107884, A107886, A107887, A107888.

Sequence in context: A106361 A113040 A007002 this_sequence A051271 A028405 A014645

Adjacent sequences: A107882 A107883 A107884 this_sequence A107886 A107887 A107888

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Jun 04 2005