Number of -2..2 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero.

A199937

Number of -2..2 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero.

Terms

    a(0) =4a(1) =12a(2) =36a(3) =104a(4) =302a(5) =868a(6) =2490a(7) =7132a(8) =20424a(9) =58418a(10) =167036a(11) =477412a(12) =1364340a(13) =3898236a(14) =11138194a(15) =31824012a(16) =90926724a(17) =259790792a(18) =742259560a(19) =2120727868a(20) =6059178186a(21) =17311798890a(22) =49461883130a(23) =141318491362a(24) =403763748824

External references