a(n) = A000676(n) - A000677(n).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =0a(5) =1a(6) =0a(7) =3a(8) =1a(9) =7a(10) =4a(11) =19a(12) =17a(13) =63a(14) =77a(15) =217a(16) =326a(17) =815a(18) =1435a(19) =3533a(20) =7227a(21) =17709a(22) =39704a(23) =97010a(24) =228123a(25) =561216a(26) =1366962a(27) =3423504a(28) =8601350a(29) =22000341