Number of zero-sum -6..6 arrays of n elements with first through third differences also in -6..6.
A202509
Number of zero-sum -6..6 arrays of n elements with first through third differences also in -6..6.
Terms
- a(0) =1a(1) =7a(2) =47a(3) =217a(4) =1041a(5) =5429a(6) =29295a(7) =161469a(8) =890659a(9) =4953959a(10) =27653867a(11) =154912145a(12) =870424381a(13) =4906927687a(14) =27742701519a(15) =157251702011a(16) =893270398075
External references
- oeis: A202509