Column 12 of an array illustrated in A089584 and related to A034261.

Terms

a(0) =9a(1) =284a(2) =3004a(3) =19078a(4) =88938a(5) =335612a(6) =1084387a(7) =3109060a(8) =8104089a(9) =19539904a(10) =44141520a(11) =94346102a(12) =192252586a(13) =375787005a(14) =708083995a(15) =1291443529a(16) =2287680232a(17) =3947261426a(18) =6650353141a(19) =10963787826a(20) =17719064134a(21) =28117822582a(22) =43872849975a(23) =67394593662a(24) =102035462287a(25) =152406906280