G.f. A(x) satisfies: 4^n - 1 = Sum_{k=0..n} [x^k] A(x)^n and also satisfies: (4+z)^n - (1+z)^n + z^n = Sum_{k=0..n} [x^k](A(x)+z*x)^n for all z, where [x^k] A(x)^n denotes the coefficient of x^k in A(x)^n.
A100228
G.f. A(x) satisfies: 4^n - 1 = Sum_{k=0..n} [x^k] A(x)^n and also satisfies: (4+z)^n - (1+z)^n + z^n = Sum_{k=0..n} [x^k](A(x)+z*x)^n for all z, where [x^k] A(x)^n denotes the coefficient of x^k in A(x)^n.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =-3a(4) =-6a(5) =24a(6) =3a(7) =-183a(8) =273a(9) =1131a(10) =-4407a(11) =-3081a(12) =48360a(13) =-54750a(14) =-396195a(15) =1282551a(16) =1860186a(17) =-17122944a(18) =11240049a(19) =166745823a(20) =-432682314a(21) =-1054472016a(22) =6822994737a(23) =-835915197a(24) =-76044224139a(25) =152526011235a(26) =587055710271
External references
- oeis: A100228