Number of nondecreasing strings of numbers x(i=1..n) in -4..4 with sum x(i)^3 equal to 0.

Terms

a(0) =1a(1) =5a(2) =5a(3) =15a(4) =15a(5) =37a(6) =41a(7) =84a(8) =106a(9) =186a(10) =256a(11) =400a(12) =570a(13) =834a(14) =1184a(15) =1663a(16) =2305a(17) =3149a(18) =4241a(19) =5669a(20) =7455a(21) =9771a(22) =12607a(23) =16216a(24) =20592a(25) =26014a(26) =32578a(27) =40526a(28) =50112a(29) =61530