a(n) = n^3 * 3^n.

Terms

a(0) =0a(1) =3a(2) =72a(3) =729a(4) =5184a(5) =30375a(6) =157464a(7) =750141a(8) =3359232a(9) =14348907a(10) =59049000a(11) =235782657a(12) =918330048a(13) =3502727631a(14) =13124466936a(15) =48427561125a(16) =176319369216a(17) =634465620819