Number of 0..n arrays x(0..7) of 8 elements with zero 4th differences.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =13a(6) =28a(7) =43a(8) =58a(9) =87a(10) =116a(11) =159a(12) =206a(13) =271a(14) =350a(15) =453a(16) =566a(17) =689a(18) =828a(19) =1007a(20) =1226a(21) =1481a(22) =1744a(23) =2035a(24) =2366a(25) =2753a(26) =3158a(27) =3653a(28) =4172a(29) =4787