0,2

G.f.: (1+x)*(1-3*x+18*x^2-78*x^3+45*x^4-175*x^5)/(1+6*x^2+25*x^4)^2.

(PARI) {a(n)=polcoeff((1+x)*(1-3*x+18*x^2-78*x^3+45*x^4-175*x^5)/(1+6*x^2+25*x^4 +x*O(x^n))^2, n)}

Cf. A118441 (triangle), A118442 (column 0), A118444 (a(n)/(n+1)); A118435.

Sequence in context: A084191 A080357 A064032 this_sequence A109748 A062459 A118370

Adjacent sequences: A118440 A118441 A118442 this_sequence A118444 A118445 A118446

sign

Paul D. Hanna (pauldhanna(AT)juno.com), Apr 28 2006