a(n) = A001609(n^2) for n>=1, where g.f. of A001609 is x*(1+3*x^2)/(1-x-x^3).
A228647
a(n) = A001609(n^2) for n>=1, where g.f. of A001609 is x*(1+3*x^2)/(1-x-x^3).
Terms
- a(0) =1a(1) =5a(2) =31a(3) =453a(4) =14131a(5) =946781a(6) =136250983a(7) =42115660581
External references
- oeis: A228647