Number of partitions of n with two sorts of part 1.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =24a(5) =50a(6) =104a(7) =212a(8) =431a(9) =870a(10) =1752a(11) =3518a(12) =7057a(13) =14138a(14) =28310a(15) =56661a(16) =113377a(17) =226820a(18) =453728a(19) =907561a(20) =1815259a(21) =3630683a(22) =7261576a(23) =14523405a(24) =29047130a(25) =58094643a(26) =116189764a(27) =232380102a(28) =464760912a(29) =929522671