Generating function = g(g(x)), where g(x) = g.f. of Jacobsthal numbers A001045.

A301699

Generating function = g(g(x)), where g(x) = g.f. of Jacobsthal numbers A001045.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =8a(4) =26a(5) =94a(6) =330a(7) =1178a(8) =4186a(9) =14914a(10) =53098a(11) =189122a(12) =673530a(13) =2398834a(14) =8543498a(15) =30428162a(16) =108371354a(17) =385970386a(18) =1374653610a(19) =4895901602a(20) =17437011514a(21) =62102837746a(22) =221182535242a(23) =787753281218

External references