a(n) = A053656(n) - A000011(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =1a(7) =4a(8) =7a(9) =18a(10) =31a(11) =70a(12) =126a(13) =261a(14) =484a(15) =960a(16) =1800a(17) =3515a(18) =6643a(19) =12852a(20) =24458a(21) =47151a(22) =90157a(23) =173744a(24) =333498a(25) =643230a(26) =1238671a(27) =2392650a(28) =4620006a(29) =8939676