Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + A(x))^n = 1 + 3*Sum_{n>=1} (-1)^n * x^(n^2).
A370021
Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + A(x))^n = 1 + 3*Sum_{n>=1} (-1)^n * x^(n^2).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =22a(5) =63a(6) =155a(7) =415a(8) =1124a(9) =2957a(10) =8047a(11) =21817a(12) =59048a(13) =161870a(14) =442675a(15) =1214563a(16) =3348145a(17) =9228858a(18) =25514319a(19) =70682731a(20) =195993889a(21) =544578231a(22) =1515027660a(23) =4219560585a(24) =11768353857a(25) =32853953466a(26) =91812137378a(27) =256831830373a(28) =719046731299
External references
- oeis: A370021