741556

Appears in sequences

• Number of 3 X n checkerboards (with at least one red square) in which the set of red squares is edge-connected.at n=8A059021
• Array read by antidiagonals: T(m,n) = number of nonzero m X n binary arrays with all 1's connected.at n=47A287151
• Array read by antidiagonals: T(m,n) = number of nonzero m X n binary arrays with all 1's connected.at n=52A287151