Number of n X n symmetric 0..7 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..7 introduced in lower triangular row major order.
A193001
Number of n X n symmetric 0..7 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..7 introduced in lower triangular row major order.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =6a(4) =35a(5) =697a(6) =19477a(7) =1567298a(8) =211653572a(9) =80504100636
External references
- oeis: A193001