1280128950

Appears in sequences

• Number of n X n binary matrices with no 2 adjacent 1's, or number of configurations of non-attacking princes on an n X n board, where a "prince" attacks the four adjacent (non-diagonal) squares. Also number of independent vertex sets in an n X n grid.at n=7A006506
• Number of 7 X n matrices with entries {0,1} without adjacent 0's in any row or column. 7th row of A089934.at n=6A089938
• Duplicate of A006506.at n=7A181030