Number of 0..n arrays x(0..6) of 7 elements with zero 6th difference.

Terms

a(0) =2a(1) =45a(2) =182a(3) =685a(4) =2036a(5) =5153a(6) =11370a(7) =23035a(8) =43284a(9) =76523a(10) =129052a(11) =208597a(12) =324900a(13) =491519a(14) =723994a(15) =1041095a(16) =1467042a(17) =2029069a(18) =2759166a(19) =3697749a(20) =4888510a(21) =6381185a(22) =8237500a(23) =10523625a(24) =13313648a(25) =16697587a(26) =20769202a(27) =25633157a(28) =31415424a(29) =38246327