Number of zero-sum -6..6 arrays of n elements with first and second differences also in -6..6.
A201871
Number of zero-sum -6..6 arrays of n elements with first and second differences also in -6..6.
Terms
- a(0) =1a(1) =7a(2) =47a(3) =285a(4) =1905a(5) =13635a(6) =99143a(7) =734607a(8) =5477087a(9) =40989699a(10) =307950303a(11) =2320964021a(12) =17543356961a(13) =132967038437
External references
- oeis: A201871