Number of zero-sum -4..4 arrays of n elements with first and second differences also in -4..4.

A201869

Number of zero-sum -4..4 arrays of n elements with first and second differences also in -4..4.

Terms

    a(0) =1a(1) =5a(2) =21a(3) =95a(4) =443a(5) =2191a(6) =11107a(7) =57203a(8) =296293a(9) =1541117a(10) =8043485a(11) =42109417a(12) =221085605a(13) =1163918489a(14) =6142786425a(15) =32491880113a(16) =172201763497a(17) =914222792849

External references