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%I #11 Nov 04 2023 18:24:35
%S 1,4,36,660,16687
%N Number of free n-polyominoids, allowing both corner- and edge-connections.
%C These structures could be called polypletoids (or pseudo-polyominoids), because they are related to polyplets (polyominoids) as polyominoids (pseudo-polyominoes) are related to polyominoes.
%H Pontus von Brömssen, <a href="/A365650/a365650.svg">Illustration for sizes 1..3</a>.
%H <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>.
%Y Cf. A000105 (polyominoes), A030222 (polyplets), A075679 (polyominoids), A365651 (fixed), A365652 (corner-connections only).
%Y 30th row of A366766.
%K nonn,hard,more
%O 1,2
%A _Pontus von Brömssen_, Sep 17 2023
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