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Number of multi-directed animals with n vertices.
0

%I #10 Apr 19 2013 15:29:53

%S 1,4,20,110,636,3790,23036,141946,883360,5538098,34917224,221125102,

%T 1405276324,8956020294,57209977908,366147270370,2347081505816,

%U 15065301857194,96808851937152,622682497349910,4008412023724124,25821543284366686,166438749582676204

%N Number of multi-directed animals with n vertices.

%H A. Bacher, <a href="http://arxiv.org/abs/1301.1365">Directed and multi-directed animals on the square lattice with next nearest neighbor edges</a>, arXiv 1301.1365, 2013. See M(t).

%F See Theorem 9 of Bacher (2013) for a generating function.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Feb 14 2013