G.f. satisfies: A(x) = Product_{n>=0} 1/(1-a(n)*x^(n+1))^2 = Sum_{n>=0} a(n)*x^n.
A093638
G.f. satisfies: A(x) = Product_{n>=0} 1/(1-a(n)*x^(n+1))^2 = Sum_{n>=0} a(n)*x^n.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =109a(5) =466a(6) =2142a(7) =9870a(8) =47438a(9) =228750a(10) =1133373a(11) =5618252a(12) =28431660a(13) =143809690a(14) =738803296a(15) =3794224624a(16) =19718366257a(17) =102416655624a(18) =537315418006
External references
- oeis: A093638