a(n) = A000785(n) - A005575(n-1).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =2a(8) =10a(9) =19a(10) =52a(11) =105a(12) =224a(13) =429a(14) =820a(15) =1484a(16) =2668a(17) =4627a(18) =7928a(19) =13305a(20) =22050a(21) =35988a(22) =58128a(23) =92792a(24) =146790a(25) =230082a(26) =357831a(27) =552310a(28) =846876a(29) =1290231