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

1,6

Links

Table of n, a(n) for n=1..23.

John Mason, Illustrations

Example

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.

Crossrefs

Cf. A147680.

Sequence in context: A325937 A327167 A268372 * A298848 A193518 A060176

Adjacent sequences: A361751 A361752 A361753 * A361755 A361756 A361757

Keyword

nonn,more

Author

John Mason and Allan C. Wechsler, Mar 23 2023

Status

approved