a(n) = n*(945*n^4 - 3150*n^3 + 4095*n^2 - 2370*n + 496).

Terms

a(0) =0a(1) =16a(2) =4112a(3) =65208a(4) =387424a(5) =1439480a(6) =4068096a(7) =9611392a(8) =20012288a(9) =37931904a(10) =66862960a(11) =111243176a(12) =176568672a(13) =269507368a(14) =398012384a(15) =571435440a(16) =800640256a(17) =1098115952a(18) =1478090448a(19) =1956643864a(20) =2551821920a(21) =3283749336a(22) =4174743232a(23) =5249426528a(24) =6534841344a(25) =8060562400