a(n) = n*(n + 7)*(n + 14)*(n + 21)*(n + 28)/120.

Terms

a(0) =0a(1) =638a(2) =1656a(3) =3162a(4) =5280a(5) =8151a(6) =11934a(7) =16807a(8) =22968a(9) =30636a(10) =40052a(11) =51480a(12) =65208a(13) =81549a(14) =100842a(15) =123453a(16) =149776a(17) =180234a(18) =215280a(19) =255398a(20) =301104a(21) =352947a(22) =411510a(23) =477411a(24) =551304a(25) =633880a(26) =725868a(27) =828036a(28) =941192a(29) =1066185