Hexagonal prism numbers: a(n) = (n + 1)*(3*n^2 + 3*n + 1).

Terms

a(0) =1a(1) =14a(2) =57a(3) =148a(4) =305a(5) =546a(6) =889a(7) =1352a(8) =1953a(9) =2710a(10) =3641a(11) =4764a(12) =6097a(13) =7658a(14) =9465a(15) =11536a(16) =13889a(17) =16542a(18) =19513a(19) =22820a(20) =26481a(21) =30514a(22) =34937a(23) =39768a(24) =45025a(25) =50726a(26) =56889a(27) =63532a(28) =70673a(29) =78330