Number of zero-sum -6..6 arrays of n elements with first through fourth differences also in -6..6.
A201437
Number of zero-sum -6..6 arrays of n elements with first through fourth differences also in -6..6.
Terms
- a(0) =1a(1) =7a(2) =47a(3) =217a(4) =837a(5) =3067a(6) =11591a(7) =46521a(8) =189527a(9) =794867a(10) =3212411a(11) =13228131a(12) =54776691a(13) =227656973a(14) =950625037a(15) =3969330087a(16) =16629156327a(17) =69823182357a(18) =293680456429
External references
- oeis: A201437