Expansion of g*(1 + x*g^2), where g = 1+x*g^4 is the g.f. of A002293.
A391381
Expansion of g*(1 + x*g^2), where g = 1+x*g^4 is the g.f. of A002293.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =37a(4) =231a(5) =1581a(6) =11473a(7) =86710a(8) =675207a(9) =5379616a(10) =43645052a(11) =359336341a(12) =2994665297a(13) =25213773690a(14) =214149202470
External references
- oeis: A391381