A216821 - OEIS

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A216821

Number of standardized 4-connected side polyominoes of inner site-perimeter n.

%I #11 Oct 10 2023 09:46:39

%S 0,1,1,5,13,54,182,782,3080,13250

%N Number of standardized 4-connected side polyominoes of inner site-perimeter n.

%H J. Fortier, A. Goupil, J. Lortie and J. Tremblay, <a href="https://doi.org/10.1016/j.tcs.2012.02.032">Exhaustive generation of gominoes</a>, Theoretical Computer Science, 502 (2013), 76-87.

%K nonn,more

%O 2,4

%A _N. J. A. Sloane_, Sep 20 2012