A075679 Number of free (rotations and reflections count as same shape) polyominoids (shapes made of faces of cubes) with n squares.

1, 2, 9, 54, 448, 4650, 53611, 655033, 8259635, 106371085, 1391032357, 18412269694

Offset

1,2

Links

Table of n, a(n) for n=1..12.

John Mason, Drawings of polyominoids of sizes 1 through 5

Skye Rothstein, Folding and Embedding Cubical Complexes, Undergraduate senior project, Bard College (2024). See p. 9.

Wikipedia, Polyominoid

Crossrefs

Cf. A075678, A056846.

18th row of A366766.

Sequence in context: A353255 A254795 A064151 * A001757 A267225 A078455

Adjacent sequences: A075676 A075677 A075678 * A075680 A075681 A075682

Keyword

hard,more,nonn

Author

Joseph Myers, Sep 24 2002

Status

approved