Number of partitions of n with two sorts of part 1 which are introduced in ascending order.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =13a(5) =26a(6) =54a(7) =108a(8) =219a(9) =439a(10) =882a(11) =1766a(12) =3539a(13) =7081a(14) =14172a(15) =28351a(16) =56716a(17) =113443a(18) =226908a(19) =453833a(20) =907698a(21) =1815424a(22) =3630893a(23) =7261829a(24) =14523725a(25) =29047513a(26) =58095121a(27) =116190338a(28) =232380810a(29) =464761759