The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #9 Dec 04 2023 16:44:01
%S 3,42,838,19323,484371
%N Number of fixed polyominoids with n cells, allowing right-angled corner-connections and any edge-connections.
%C See A365995 for further details and a table of related sequences.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyominoid">Polyominoid</a>.
%H <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>.
%Y Cf. A365995, A366005 (free).
%Y 26th row of A366767.
%K nonn,hard,more
%O 1,1
%A _Pontus von Brömssen_, Sep 28 2023