a(n) = 3^5 * binomial(n+4, 5).

Terms

a(0) =243a(1) =1458a(2) =5103a(3) =13608a(4) =30618a(5) =61236a(6) =112266a(7) =192456a(8) =312741a(9) =486486a(10) =729729a(11) =1061424a(12) =1503684a(13) =2082024a(14) =2825604a(15) =3767472a(16) =4944807a(17) =6399162a(18) =8176707a(19) =10328472a(20) =12910590a(21) =15984540a(22) =19617390a(23) =23882040a(24) =28857465a(25) =34628958a(26) =41288373a(27) =48934368a(28) =57672648a(29) =67616208