Number of 0..n arrays x(0..8) of 9 elements with zero 5th differences.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =9a(6) =26a(7) =49a(8) =76a(9) =117a(10) =174a(11) =257a(12) =348a(13) =505a(14) =704a(15) =965a(16) =1290a(17) =1655a(18) =2080a(19) =2605a(20) =3346a(21) =4255a(22) =5252a(23) =6403a(24) =7734a(25) =9275a(26) =10998a(27) =13237a(28) =15704a(29) =18585