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.

A365997 Number of free polyominoids with n cells, allowing flat corner-connections and any edge-connections.

This page as a plain text file.
%I A365997 #10 Nov 04 2023 18:25:06
%S A365997 1,3,14,129,1555,24144
%N A365997 Number of free polyominoids with n cells, allowing flat corner-connections and any edge-connections.
%H A365997 Pontus von Brömssen, <a href="/A365997/a365997.svg">Illustration for sizes 1..3</a>.
%H A365997 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyominoid">Polyominoid</a>.
%H A365997 <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>.
%Y A365997 See A365995 for further details and a table of related sequences.
%Y A365997 Cf. A365998 (fixed).
%Y A365997 22nd row of A366766.
%K A365997 nonn,hard,more
%O A365997 1,2
%A A365997 _Pontus von Brömssen_, Sep 26 2023

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.