Number of triples (i,j,k) such that i+j+k > 0 with -n <= i,j,k <= n.

Terms

a(0) =0a(1) =10a(2) =53a(3) =153a(4) =334a(5) =620a(6) =1035a(7) =1603a(8) =2348a(9) =3294a(10) =4465a(11) =5885a(12) =7578a(13) =9568a(14) =11879a(15) =14535a(16) =17560a(17) =20978a(18) =24813a(19) =29089a(20) =33830a(21) =39060a(22) =44803a(23) =51083a(24) =57924a(25) =65350a(26) =73385a(27) =82053a(28) =91378a(29) =101384