a(n) = (12*n + 1)*(5184*n^2 + 540*n + 13).

Terms

a(0) =13a(1) =74581a(2) =545725a(3) =1786693a(4) =4170733a(5) =8071093a(6) =13861021a(7) =21913765a(8) =32602573a(9) =46300693a(10) =63381373a(11) =84217861a(12) =109183405a(13) =138651253a(14) =172994653a(15) =212586853a(16) =257801101a(17) =309010645a(18) =366588733a(19) =430908613a(20) =502343533a(21) =581266741a(22) =668051485a(23) =763071013a(24) =866698573a(25) =979307413a(26) =1101270781