a(n) = sum of cubes of the coefficients of x^n in x^(n-3k)*A(x^3)^(n-3k+1), as k varies from 0 to floor(n/3) for n>0, with a(0)=1.

A121643

a(n) = sum of cubes of the coefficients of x^n in x^(n-3k)*A(x^3)^(n-3k+1), as k varies from 0 to floor(n/3) for n>0, with a(0)=1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =9a(5) =28a(6) =66a(7) =153a(8) =433a(9) =1352a(10) =4104a(11) =12188a(12) =37506a(13) =124155a(14) =422307a(15) =1437135a(16) =5058945a(17) =18255295a(18) =65336580a(19) =232233723a(20) =832793160a(21) =3003712770a(22) =10788778026a(23) =38582183151a(24) =137946936834a(25) =493981065171

External references