a(n) = A000085(n) - (1 + Sum_{j=1..n-1} A000085(j)).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =8a(6) =32a(7) =112a(8) =412a(9) =1504a(10) =5760a(11) =22464a(12) =91224a(13) =379424a(14) =1632896a(15) =7201472a(16) =32709136a(17) =152094976a(18) =725810176a(19) =3540883968a(20) =17680145184a(21) =90115509888a(22) =469094763008