a(n) = A216951(n)/2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =4a(6) =1a(7) =5a(8) =4a(9) =7a(10) =1a(11) =20a(12) =1a(13) =20a(14) =16a(15) =44a(16) =1a(17) =96a(18) =1a(19) =162a(20) =50a(21) =282a(22) =1a(23) =678a(24) =16a(25) =1113a(26) =185a(27) =2282a(28) =1a(29) =4828