Partial sums of A024012.

Terms

a(0) =1a(1) =2a(2) =2a(3) =1a(4) =1a(5) =8a(6) =36a(7) =115a(8) =307a(9) =738a(10) =1662a(11) =3589a(12) =7541a(13) =15564a(14) =31752a(15) =64295a(16) =129575a(17) =260358a(18) =522178a(19) =1046105a(20) =2094281a(21) =4190992a(22) =8384812a(23) =16772891a(24) =33549531a(25) =67103338a(26) =134211526a(27) =268428525a(28) =536863197a(29) =1073733268