Bisection (odd part) of number of partitions that do not contain 1 as a part A002865.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =8a(5) =14a(6) =24a(7) =41a(8) =66a(9) =105a(10) =165a(11) =253a(12) =383a(13) =574a(14) =847a(15) =1238a(16) =1794a(17) =2573a(18) =3660a(19) =5170a(20) =7245a(21) =10087a(22) =13959a(23) =19196a(24) =26252a(25) =35717a(26) =48342a(27) =65121a(28) =87331a(29) =116600