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

Terms

a(0) =9a(1) =100a(2) =605a(3) =2640a(4) =9295a(5) =28028a(6) =75075a(7) =183040a(8) =413270a(9) =875160a(10) =1755182a(11) =3359200a(12) =6172530a(13) =10943240a(14) =18795370a(15) =31380096a(16) =51074375a(17) =81238300a(18) =126544275a(19) =193393200a(20) =290435145a(21) =429214500a(22) =624962325a(23) =897561600a(24) =1272714300a(25) =1783342704a(26) =2471261100a(27) =3389158080