Expansion of (A(x)^2-A(x^2))/2 where A(x) = A001006(x)-1.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =5a(5) =17a(6) =45a(7) =129a(8) =349a(9) =970a(10) =2658a(11) =7364a(12) =20363a(13) =56634a(14) =157750a(15) =441084a(16) =1236173a(17) =3474672a(18) =9789568a(19) =27648486a(20) =78254719a(21) =221951037a(22) =630717569a(23) =1795576937a(24) =5120472435a(25) =14625574662a(26) =41837913310a(27) =119851980508a(28) =343798008165a(29) =987445317761