Number of distinct values of the sum of 3 products of two 0..n integers.

Terms

a(0) =1a(1) =4a(2) =12a(3) =25a(4) =43a(5) =67a(6) =95a(7) =130a(8) =169a(9) =215a(10) =267a(11) =324a(12) =385a(13) =454a(14) =527a(15) =606a(16) =692a(17) =784a(18) =880a(19) =983a(20) =1090a(21) =1205a(22) =1325a(23) =1449a(24) =1578a(25) =1716a(26) =1860a(27) =2008a(28) =2162a(29) =2323