217210

Appears in sequences

• Count of interior bounded regions in a regular 2n-sided polygon dissected by all diagonals parallel to sides.at n=32A165217
• Number of (n+2)X(n+2) binary arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.at n=14A190024
• Number of permutations of [n] avoiding {4231, 3412, 1234}.at n=18A294725
• Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.at n=15A298290