Number of 0..n arrays x(0..5) of 6 elements with zero 5th difference.

Terms

a(0) =8a(1) =39a(2) =112a(3) =275a(4) =730a(5) =1589a(6) =3000a(7) =5181a(8) =8350a(9) =13871a(10) =21588a(11) =32019a(12) =45682a(13) =63225a(14) =88580a(15) =120521a(16) =159996a(17) =208123a(18) =266020a(19) =342493a(20) =433532a(21) =540855a(22) =666180a(23) =811455a(24) =992870a(25) =1201725a(26) =1440468a(27) =1711817a(28) =2018490a(29) =2387707