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

Terms

a(0) =5142a(1) =11200a(2) =22563a(3) =42593a(4) =76251a(5) =130453a(6) =214784a(7) =341988a(8) =528926a(9) =797248a(10) =1174631a(11) =1695625a(12) =2403243a(13) =3350003a(14) =4599874a(15) =6229576a(16) =8330912a(17) =11012320a(18) =14401669a(19) =18648073a(20) =23925159a(21) =30433213a(22) =38402946a(23) =48097954a(24) =59819074a(25) =73907174a(26) =90748085a(27) =110775805a(28) =134478037