(Terms in A029643)/2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =8a(5) =1a(6) =1a(7) =18a(8) =1a(9) =1a(10) =98a(11) =70a(12) =32a(13) =1a(14) =168a(15) =102a(16) =1a(17) =357a(18) =270a(19) =50a(20) =1a(21) =627a(22) =1a(23) =1320a(24) =605a(25) =253a(26) =72a(27) =1a(28) =858a(29) =325