a(n) = 9*(n+1)*binomial(n+2,9)/2.

Terms

a(0) =36a(1) =405a(2) =2475a(3) =10890a(4) =38610a(5) =117117a(6) =315315a(7) =772200a(8) =1750320a(9) =3719430a(10) =7482618a(11) =14360580a(12) =26453700a(13) =47006190a(14) =80901810a(15) =135326664a(16) =220641300a(17) =351511875a(18) =548358525a(19) =839188350a(20) =1261890630a(21) =1867083075a(22) =2721610125a(23) =3912807600a(24) =5553662400a(25) =7789011516a(26) =10802941380