Number of zero-sum -7..7 arrays of n elements with first and second differences also in -7..7.
A201872
Number of zero-sum -7..7 arrays of n elements with first and second differences also in -7..7.
Terms
- a(0) =1a(1) =7a(2) =57a(3) =431a(4) =3373a(5) =27647a(6) =232969a(7) =1990383a(8) =17103271a(9) =147612131a(10) =1278588895a(11) =11110113949a(12) =96822737023a(13) =846090334081
External references
- oeis: A201872