Number of lower triangles of an n X n 0..4 array with no element greater than the number its nonzero horizontal and vertical neighbors.
A195951
Number of lower triangles of an n X n 0..4 array with no element greater than the number its nonzero horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =5a(2) =162a(3) =19913a(4) =10408097a(5) =23663085157
External references
- oeis: A195951