Number of zero-sum -7..7 arrays of n elements with first through fourth differences also in -7..7.
A201438
Number of zero-sum -7..7 arrays of n elements with first through fourth differences also in -7..7.
Terms
- a(0) =1a(1) =7a(2) =57a(3) =297a(4) =1333a(5) =6019a(6) =27087a(7) =126147a(8) =592487a(9) =2795067a(10) =13283639a(11) =63243395a(12) =302028473a(13) =1447178413a(14) =6955639001a(15) =33526007827a(16) =161977137395a(17) =784134070729
External references
- oeis: A201438