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%I #14 Jan 28 2026 11:50:59
%S 1,3,54,2030,96853,5023549,271823709
%N Number of one-sided polyquoins with n cells.
%C A polyquoin (term coined by George Sicherman) is like a polycube, but the cells can be joined across a complete, half or quarter-face, like a three-dimensional polynar.
%H George Sicherman, <a href="https://sicherman.net/qncatalogue/index.html">Catalogue of Polyquoins</a>.
%Y Cf. A000162, A390621, A392939 (free), A392941 (fixed).
%K nonn,more,hard
%O 1,2
%A _John Mason_, Jan 27 2026