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A005963 Number of restricted hexagonal polyominoes with n cells.
(Formerly M1969)
7

%I M1969

%S 0,0,1,2,10,45,210,1002,4883,23797,116518,571471

%N Number of restricted hexagonal polyominoes with n cells.

%D A. T. Balaban, Enumeration of Cyclic Graphs, pp. 63-105 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976; see p. 75.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%Y Equals A000228 - A002216.

%Y Cf. A036359, A002216, A005963, A000228, A001998.

%K nonn

%O 1,4

%A _N. J. A. Sloane_.

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Last modified July 8 08:08 EDT 2020. Contains 335520 sequences. (Running on oeis4.)