Column 9 of array illustrated in A089574 and related to A034261.

Terms

a(0) =6a(1) =126a(2) =992a(3) =4921a(4) =18450a(5) =57198a(6) =154420a(7) =375106a(8) =838075a(9) =1749221a(10) =3449895a(11) =6485363a(12) =11699374a(13) =20362113a(14) =34340211a(15) =56319046a(16) =90089305a(17) =140911696a(18) =215975810a(19) =324971445a(20) =480793226a(21) =700402096a(22) =1005870222a(23) =1425639066a(24) =1996023823a(25) =2763001135a(26) =3784320961a(27) =5131987727a(28) =6895160406a(29) =9183525995