Number of -2..2 arrays of n elements with first and second differences also in -2..2.

A201082

Number of -2..2 arrays of n elements with first and second differences also in -2..2.

Terms

    a(0) =5a(1) =19a(2) =57a(3) =175a(4) =537a(5) =1653a(6) =5089a(7) =15663a(8) =48207a(9) =148375a(10) =456685a(11) =1405633a(12) =4326401a(13) =13316243a(14) =40986117a(15) =126151337a(16) =388281713a(17) =1195093865a(18) =3678384289a(19) =11321714051a(20) =34847150005a(21) =107256185601a(22) =330124252601

External references