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Number of figure 8's with 2n edges on the square lattice.
(Formerly M1850)
3

%I M1850 #19 Oct 21 2023 20:00:26

%S 2,8,32,144,708,3696,20296,115624,676828,4044744,24565432

%N Number of figure 8's with 2n edges on the square lattice.

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

%D S. G. Whittington and J. P. Valleau, Figure eights on the square lattice: enumeration and Monte Carlo estimation, J. Phys. A 3 (1970), 21-27.

%H Sean A. Irvine, <a href="/A003304/a003304.pdf">Illustration of initial terms</a>.

%K nonn,more

%O 2,1

%A _N. J. A. Sloane_

%E a(9)-a(12) from _Sean A. Irvine_, Mar 20 2017