Number of n X n integer matrices, symmetric under horizontal reflection, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
A141440
Number of n X n integer matrices, symmetric under horizontal reflection, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
Terms
- a(0) =1a(1) =3a(2) =121a(3) =771a(4) =317259a(5) =4380445a(6) =18838482047a(7) =567241901289
External references
- oeis: A141440