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%I #5 Jan 30 2026 09:53:17
%S 1,4,20,110,642,3892,24248,154107,994676,6498608,42880492,285264740,
%T 1910838742,12874939616
%N Number of fixed polyjogs with n cells.
%C A polyjog is a polyform composed of n connected unit squares adjoined along half-edges: every pair of adjacent cells shares an edge of length exactly 1/2.
%C In this sequence, figures that differ by a rotation or reflection are considered distinct.
%H George Sicherman, <a href="http://www.recmath.org/PolyCur/polyjogs/">Catalogue of Polyjogs</a>
%Y Cf. A354308, A393004, A390622.
%K nonn,more,hard
%O 1,2
%A _John Mason_, Jan 30 2026