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%I #12 May 31 2016 09:36:48
%S 4,4,12,16,28,32,52,64,80,96,124
%N On an n X n board, a(n) is the maximal number of squares covered by a self-avoiding cycle made of alternated vertical and horizontal unit length steps.
%C From an idea of _Leroy Quet_, discussed on the SeqFan mailing list.
%H Diophante.fr, <a href="http://www.diophante.fr/accueil">LES RECREATIONS MATHEMATIQUES</a>, PLUS DE 2000 RECREATIONS ET PROBLEMES MATHEMATIQUES. See Problem G264.
%H Giovanni Resta, <a href="/A157617/a157617.pdf">Illustration of initial terms</a>
%Y Cf. A157615, A157616.
%K hard,more,nonn
%O 2,1
%A _Giovanni Resta_, Mar 03 2009
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