Number of -4..4 arrays of n elements with first, second and third differences also in -4..4.

A202120

Number of -4..4 arrays of n elements with first, second and third differences also in -4..4.

Terms

    a(0) =9a(1) =61a(2) =323a(3) =1279a(4) =5205a(5) =21093a(6) =85771a(7) =348841a(8) =1418711a(9) =5769945a(10) =23467095a(11) =95443593a(12) =388180467a(13) =1578775913a(14) =6421070989a(15) =26115267153a(16) =106213924727a(17) =431984776463

External references