Number of zero-sum -4..4 arrays of n elements with first through third differences also in -4..4.
A202507
Number of zero-sum -4..4 arrays of n elements with first through third differences also in -4..4.
Terms
- a(0) =1a(1) =5a(2) =21a(3) =75a(4) =239a(5) =883a(6) =3285a(7) =12619a(8) =48079a(9) =185533a(10) =718529a(11) =2793599a(12) =10889311a(13) =42597829a(14) =167140877a(15) =657518773a(16) =2592183923a(17) =10238899137a(18) =40508826935a(19) =160499036493a(20) =636728024223
External references
- oeis: A202507