a(n) = Sum_{k=0..n} k^5 * (-1)^k * 3^(n-k) * binomial(n,k).

Terms

a(0) =0a(1) =-1a(2) =26a(3) =18a(4) =-272a(5) =-1400a(6) =-4032a(7) =-7168a(8) =-1024a(9) =55296a(10) =294400a(11) =1086976a(12) =3354624a(13) =9132032a(14) =22249472a(15) =47923200a(16) =85983232a(17) =99155968a(18) =-102629376a(19) =-1237712896a(20) =-5688524800a(21) =-20775960576a(22) =-67868033024a(23) =-207022456832a(24) =-602167836672