a(n) = 11*(n+1)*binomial(n+2,11)/2.

Terms

a(0) =55a(1) =726a(2) =5148a(3) =26026a(4) =105105a(5) =360360a(6) =1089088a(7) =2975544a(8) =7482618a(9) =17551820a(10) =38798760a(11) =81477396a(12) =163601438a(13) =315762216a(14) =588376800a(15) =1062347000a(16) =1864418985a(17) =3188915730a(18) =5327982660a(19) =8713054350a(20) =13970931975a(21) =21998673840a(22) =34062462720a(23) =51926743440a(24) =78021243300