Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+x+y>1.

Terms

a(0) =0a(1) =1a(2) =20a(3) =78a(4) =199a(5) =407a(6) =726a(7) =1180a(8) =1793a(9) =2589a(10) =3592a(11) =4826a(12) =6315a(13) =8083a(14) =10154a(15) =12552a(16) =15301a(17) =18425a(18) =21948a(19) =25894a(20) =30287a(21) =35151a(22) =40510a(23) =46388a(24) =52809a(25) =59797a(26) =67376a(27) =75570a(28) =84403a(29) =93899