Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
A201346
Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =0a(1) =4a(2) =18a(3) =191a(4) =4860a(5) =310036a(6) =53350918a(7) =26097731070
External references
- oeis: A201346