Number of nondecreasing strings of numbers x(i=1..n) in -8..8 with sum x(i)^3 equal to 0.

Terms

a(0) =1a(1) =9a(2) =9a(3) =47a(4) =51a(5) =197a(6) =273a(7) =817a(8) =1415a(9) =3505a(10) =6771a(11) =14809a(12) =29081a(13) =58569a(14) =112037a(15) =212324a(16) =390100a(17) =703384a(18) =1239030a(19) =2140338a(20) =3625668a(21) =6033514a(22) =9871162a(23) =15898890a(24) =25227434a(25) =39480322a(26) =60974256a(27) =93019236a(28) =140247810a(29) =209137826