Number of 0..n arrays x(0..5) of 6 elements with zero 4th differences.

Terms

a(0) =2a(1) =7a(2) =14a(3) =27a(4) =58a(5) =111a(6) =182a(7) =279a(8) =404a(9) =617a(10) =872a(11) =1199a(12) =1580a(13) =2045a(14) =2678a(15) =3437a(16) =4300a(17) =5305a(18) =6430a(19) =7903a(20) =9530a(21) =11389a(22) =13420a(23) =15707a(24) =18460a(25) =21537a(26) =24870a(27) =28553a(28) =32518a(29) =37265