a(n) = (8*n+3)*(8*n+5)*(8*n+7)*(8*n+9).

Terms

a(0) =945a(1) =36465a(2) =229425a(3) =801009a(4) =2070705a(5) =4456305a(6) =8473905a(7) =14737905a(8) =23961009a(9) =36954225a(10) =54626865a(11) =77986545a(12) =108139185a(13) =146289009a(14) =193738545a(15) =251888625a(16) =322238385a(17) =406385265a(18) =506025009a(19) =622951665a(20) =759057585a(21) =916333425a(22) =1096868145