G.f.: A(x) = 1 + x*B(x), where B(x) = 1 + x^2*C(x)^2, C(x) = 1 + x^3*D(x)^3, D(x) = 1 + x^4*E(x)^4, ...

A228866

G.f.: A(x) = 1 + x*B(x), where B(x) = 1 + x^2*C(x)^2, C(x) = 1 + x^3*D(x)^3, D(x) = 1 + x^4*E(x)^4, ...

Terms

    a(0) =1a(1) =1a(2) =0a(3) =1a(4) =0a(5) =0a(6) =2a(7) =0a(8) =0a(9) =1a(10) =6a(11) =0a(12) =0a(13) =6a(14) =6a(15) =24a(16) =0a(17) =15a(18) =26a(19) =48a(20) =36a(21) =140a(22) =120a(23) =60a(24) =288a(25) =279a(26) =600a(27) =660a(28) =1476a(29) =822

External references