Number of nondecreasing arrangements of 7 nonzero numbers in -(n+5)..(n+5) with sum zero.

Terms

a(0) =980a(1) =2128a(2) =4238a(3) =7836a(4) =13694a(5) =22786a(6) =36454a(7) =56314a(8) =84496a(9) =123512a(10) =176534a(11) =247236a(12) =340148a(13) =460412a(14) =614240a(15) =808614a(16) =1051792a(17) =1352972a(18) =1722892a(19) =2173378a(20) =2718084a(21) =3371956a(22) =4152034a(23) =5076868a(24) =6167438a(25) =7446422a(26) =8939282a(27) =10673432a(28) =12679398a(29) =14989924