Number of strictly increasing arrangements of 5 nonzero numbers in -(n+3)..(n+3) with sum zero.

Terms

a(0) =0a(1) =4a(2) =16a(3) =42a(4) =90a(5) =172a(6) =296a(7) =482a(8) =740a(9) =1092a(10) =1554a(11) =2154a(12) =2906a(13) =3846a(14) =4992a(15) =6382a(16) =8038a(17) =10004a(18) =12302a(19) =14984a(20) =18074a(21) =21626a(22) =25670a(23) =30266a(24) =35442a(25) =41266a(26) =47770a(27) =55024a(28) =63064a(29) =71966