G.f. A(x) satisfies 2 = Sum_{n=-oo..+oo} x^n * (1 + x^n)^n * A(x)^n.
A379197
G.f. A(x) satisfies 2 = Sum_{n=-oo..+oo} x^n * (1 + x^n)^n * A(x)^n.
Terms
- a(0) =1a(1) =0a(2) =4a(3) =8a(4) =34a(5) =132a(6) =638a(7) =2820a(8) =13168a(9) =62036a(10) =300220a(11) =1464380a(12) =7227616a(13) =35973092a(14) =180572534a(15) =912481936a(16) =4639054638a(17) =23709435920a(18) =121753848044a(19) =627893481912
External references
- oeis: A379197