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A057418 Number of n-celled polyominoes with 1 hole. 6

%I

%S 1,6,37,195,975,4622,21128,94109,410820,1766591,7506179,31596240,

%T 131991619,547992183,2263477612,9309386178,38150082057,155859235424,

%U 635067478628,2581737704039

%N Number of n-celled polyominoes with 1 hole.

%H Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/animals.html">Enumeration of polyominoes</a>

%K nonn

%O 7,2

%A _N. J. A. Sloane_, Sep 05 2000

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Last modified April 11 14:58 EDT 2021. Contains 342886 sequences. (Running on oeis4.)