A056884 - OEIS

%I #14 Oct 11 2022 08:35:02

%S 0,0,0,1,5,20,84,311,1165,4276,15802,58280,216070,803116,2997360,

%T 11221443,42147842,158749808,599513836,2269390757,8609258335,

%U 32725209938,124621150623,475367241264,1816100804241,6948222137523,26618662003342,102102765921611,392095326233619,1507357249572269,5800716924062537,22344021033377558

%N Number of asymmetric n-celled polyominoes without holes.

%H John Mason, <a href="/A056884/b056884.txt">Table of n, a(n) for n = 1..40</a>

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

%F a(n) = A000104(n) - (A056879(n) + A056881(n) + A056883(n) + A056880(n) + A056882(n) + A357647(n) + A357648(n))

%Y Cf. A000104, A006749 (with holes allowed).

%K nonn

%O 1,5

%A _N. J. A. Sloane_, Sep 03 2000

%E a(27)-a(32) from _John Mason_, Oct 11 2022