Number of strictly increasing arrangements of 8 numbers in -(n+6)..(n+6) with sum zero.

Terms

a(0) =289a(1) =910a(2) =2430a(3) =5744a(4) =12346a(5) =24591a(6) =46029a(7) =81805a(8) =139143a(9) =227930a(10) =361384a(11) =556834a(12) =836618a(13) =1229093a(14) =1769773a(15) =2502617a(16) =3481445a(17) =4771508a(18) =6451232a(19) =8614108a(20) =11370764a(21) =14851235a(22) =19207395a(23) =24615603a(24) =31279561a(25) =39433366a(26) =49344790a(27) =61318804a(28) =75701312a(29) =92883137