Number of strictly increasing arrangements of 6 nonzero numbers in -(n+4)..(n+4) with sum zero.

Terms

a(0) =4a(1) =16a(2) =52a(3) =137a(4) =308a(5) =624a(6) =1154a(7) =1999a(8) =3278a(9) =5144a(10) =7772a(11) =11387a(12) =16230a(13) =22602a(14) =30830a(15) =41303a(16) =54440a(17) =70734a(18) =90706a(19) =114963a(20) =144146a(21) =178984a(22) =220244a(23) =268797a(24) =325548a(25) =391514a(26) =467756a(27) =555449a(28) =655816a(29) =770208