Number of self-complementary set partitions of {1, ..., n} with no singletons.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =3a(6) =15a(7) =16a(8) =75a(9) =89a(10) =428a(11) =571a(12) =2781a(13) =4060a(14) =20093a(15) =31697a(16) =159340a(17) =268791a(18) =1372163a(19) =2455804a(20) =12725447a(21) =24012697a(22) =126238060a(23) =249880687a(24) =1332071241a(25) =2754348360a(26) =14881206473a(27) =32029000641a(28) =175297058228a(29) =391548016475