a(n) = (4*n+3)*(4*n+5)*(4*n+7).

Terms

a(0) =105a(1) =693a(2) =2145a(3) =4845a(4) =9177a(5) =15525a(6) =24273a(7) =35805a(8) =50505a(9) =68757a(10) =90945a(11) =117453a(12) =148665a(13) =184965a(14) =226737a(15) =274365a(16) =328233a(17) =388725a(18) =456225a(19) =531117a(20) =613785a(21) =704613a(22) =803985a(23) =912285a(24) =1029897a(25) =1157205a(26) =1294593a(27) =1442445a(28) =1601145a(29) =1771077