Reversion of partitions into distinct parts A000009.

Terms

a(0) =1a(1) =-1a(2) =0a(3) =3a(4) =-7a(5) =3a(6) =31a(7) =-105a(8) =101a(9) =419a(10) =-1971a(11) =2923a(12) =5800a(13) =-40388a(14) =81147a(15) =64075a(16) =-854408a(17) =2204543a(18) =-56096a(19) =-18070916a(20) =58866158a(21) =-38939227a(22) =-371701743a(23) =1544696638a(24) =-1870286829a(25) =-7166094999a(26) =39743193694a(27) =-68677654555