Number of subsets of {1..n} with a subset summing to n + 1.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =7a(5) =15a(6) =38a(7) =79a(8) =184a(9) =378a(10) =823a(11) =1682a(12) =3552a(13) =7208a(14) =14948a(15) =30154a(16) =61698a(17) =124302a(18) =252125a(19) =506521a(20) =1022768a(21) =2051555a(22) =4127633a(23) =8272147a(24) =16607469a(25) =33258510a(26) =66680774a(27) =133467385a(28) =267349211a(29) =535007304