cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A376496 The number of free kissing polyominoes with n cells.

Original entry on oeis.org

0, 0, 0, 0, 0, 0, 1, 5, 35, 179, 909, 4287, 19723, 88240, 388260, 1683998, 7227374, 30750236
Offset: 1

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Author

John Mason, Sep 25 2024

Keywords

Comments

A polyomino is 'kissing' if there exist two cells that touch only at a corner such that no cell exists touching both edgewise simultaneously.
The sequence differs from A359520 (Number of free holey polyominoes of n cells with simply-connected interiors) at a(12) because of:
OOOO OOO
O O O O OO
OOOOO OO O
OOO
which are kissing (and hence holey) but do not have simply-connected interiors.

Crossrefs

Cf. A367557, A359520.
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