a(n) = (2*n-1)*(3*n-1)*(4*n-1)*(5*n-1).

Terms

a(0) =1a(1) =24a(2) =945a(3) =6160a(4) =21945a(5) =57456a(6) =124729a(7) =238680a(8) =417105a(9) =680680a(10) =1052961a(11) =1560384a(12) =2232265a(13) =3100800a(14) =4201065a(15) =5571016a(16) =7251489a(17) =9286200a(18) =11721745a(19) =14607600a(20) =17996121a(21) =21942544a(22) =26504985a(23) =31744440