A394392 Number of free polyominoes with n cells such that pairs of cell centers determine the largest possible number (A393992(n)) of distinct lines.

1, 1, 1, 2, 5, 1, 3, 1, 1, 1, 1, 1, 1, 9, 1, 5, 2, 1, 1, 1, 1, 1, 1

Offset

1,4

Links

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

Pontus von Brömssen, Illustration of all optimal polyominoes for 1 <= n <= 23.

Index entries for sequences related to polyominoes.

Crossrefs

Cf. A000105, A377942, A393939 (polycubes), A393992, A394393 (distinct slopes).

Sequence in context: A201890 A341923 A146097 * A091953 A228824 A388240

Adjacent sequences: A394389 A394390 A394391 * A394393 A394394 A394395

Keyword

nonn,more

Author

Pontus von Brömssen, Mar 19 2026

Status

approved