a(n) = n^4 - (n-1)^4 + (n-2)^4 - ... 0^4.

Terms

a(0) =0a(1) =1a(2) =15a(3) =66a(4) =190a(5) =435a(6) =861a(7) =1540a(8) =2556a(9) =4005a(10) =5995a(11) =8646a(12) =12090a(13) =16471a(14) =21945a(15) =28680a(16) =36856a(17) =46665a(18) =58311a(19) =72010a(20) =87990a(21) =106491a(22) =127765a(23) =152076a(24) =179700a(25) =210925a(26) =246051a(27) =285390a(28) =329266a(29) =378015