Expansion of Product_{n>=1} (1 + H(x^n)) where H(x) is the g.f. of A000081.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =35a(7) =76a(8) =175a(9) =414a(10) =1009a(11) =2510a(12) =6382a(13) =16448a(14) =42961a(15) =113352a(16) =301715a(17) =808932a(18) =2182739a(19) =5921803a(20) =16143975a(21) =44199809a(22) =121477237a(23) =335015538a(24) =926814691a(25) =2571322157a(26) =7152404733a(27) =19942874638a(28) =55729271645a(29) =156051344975