G.f. A(x) satisfies: A(x) = 1 + x + x^2 + x^3 + x^4 + x^5 + x^6 * A(x/(1 - x)) / (1 - x)^2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =15a(10) =31a(11) =63a(12) =127a(13) =257a(14) =535a(15) =1187a(16) =2891a(17) =7751a(18) =22331a(19) =66997a(20) =204473a(21) =626917a(22) =1922395a(23) =5899579a(24) =18192715a(25) =56739881a(26) =180434023a(27) =590010059a(28) =1997588833a(29) =7026454733