A361754 The number of free polyominoes of area n that fill their minimal enclosing circle (MEC). A polyomino "fills" its minimal enclosing circle if no square may be added to it that doesn't have some point outside of the circle.

1, 1, 0, 1, 1, 2, 1, 1, 1, 1, 1, 3, 2, 2, 2, 3, 2, 3, 1, 3, 2, 4, 1

Offset: 1

Author

John Mason and Allan C. Wechsler, Mar 23 2023

Keywords

• nonn
• more

Examples

			See link "Illustrations".
a(3)=0 because (i) the minimal enclosing circle of the straight tromino also contains the cross pentomino, and (ii) the MEC of the L-shaped tromino also contains the square tetromino.
		

Links

• John Mason, Illustrations

Crossrefs

Cf. A147680.