A361525 Number of ways of dividing an n X 3 rectangle into integer-sided rectangles, up to rotations and reflections.

1, 3, 17, 54, 892, 8159, 80021, 791821, 7906439, 79069308

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Formula

a(n) >= A208215(n)/4 for n != 3.

a(n) ~ A208215(n)/4.

Crossrefs

Third column of A361523.

Cf. A208215 (rotations and reflections are considered distinct), A359019 (square pieces), A360632.

Sequence in context: A173733 A294134 A258032 * A033562 A212415 A152457

Adjacent sequences: A361522 A361523 A361524 * A361526 A361527 A361528

Keyword

nonn,more

Author

Pontus von Brömssen, Mar 15 2023

Status

approved