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

Terms

a(0) =94a(1) =289a(2) =734a(3) =1656a(4) =3370a(5) =6375a(6) =11322a(7) =19138a(8) =30982a(9) =48417a(10) =73316a(11) =108108a(12) =155646a(13) =219489a(14) =303748a(15) =413442a(16) =554256a(17) =733005a(18) =957332a(19) =1236222a(20) =1579666a(21) =1999265a(22) =2507780a(23) =3119876a(24) =3851588a(25) =4721127a(26) =5748298a(27) =6955424a(28) =8366614a(29) =10008857