Number of third differences of arrays of length 8 of numbers in 0..n.

Terms

a(0) =255a(1) =6305a(2) =58911a(3) =315601a(4) =1161855a(5) =3298681a(6) =7795501a(7) =16171769a(8) =30424997a(9) =53235009a(10) =87985685a(11) =138831929a(12) =210793509a(13) =309786737a(14) =442759141a(15) =617796857a(16) =844148261a(17) =1132324321a(18) =1494179237a(19) =1942991081a(20) =2493542437a(21) =3162201041