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%I M0034 #23 Dec 27 2018 07:57:25
%S 0,1,0,2,0,5,9,21,42,76,174,396,888,2023,4345,9921,22566
%N Number of certain self-avoiding walks with n steps on square lattice (see reference for precise definition).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H W. A. Beyer, <a href="/A005208/a005208.pdf">Letter to N. J. A. Sloane, 1980</a>
%H W. A. Beyer and M. B. Wells, <a href="http://dx.doi.org/10.1016/0097-3165(72)90024-6">Lower bound for the connective constant of a self-avoiding walk on a square lattice</a>, J. Combin. Theory, A 13 (1972), 176-182.
%F a(n) = A006142(n)+2*A006143(n)+A006144(n). - _R. J. Mathar_, Oct 22 2007
%Y Cf. A001411, A037245.
%K nonn,walk,more
%O 4,4
%A _N. J. A. Sloane_
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