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

Terms

a(0) =8512a(1) =17575a(2) =33885a(3) =61731a(4) =107233a(5) =178870a(6) =288100a(7) =450096a(8) =684572a(9) =1016737a(10) =1478379a(11) =2109067a(12) =2957499a(13) =4083008a(14) =5557206a(15) =7465798a(16) =9910578a(17) =13011585a(18) =16909449a(19) =21767949a(20) =27776747a(21) =35154340a(22) =44151244a(23) =55053378a(24) =68185688a(25) =83916031