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%I #12 Nov 04 2023 18:24:49
%S 1,2,19,293,6590,168753
%N Number of free n-polyominoids, allowing corner-connections only.
%C Two squares are allowed to meet in an edge, but the structure must be connected through pure corner-connections (where the two squares meet in a single point) only. There are 3 such cases of size 3; see the linked illustration.
%H Pontus von Brömssen, <a href="/A365652/a365652.svg">Illustration for sizes 1..3</a>.
%H <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>.
%Y Cf. A075679 (polyominoids, edge-connections only), A365650 (corner- and edge-connections), A365653 (fixed).
%Y 27th row of A366766.
%K nonn,hard,more
%O 1,2
%A _Pontus von Brömssen_, Sep 17 2023
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