%I #9 Sep 17 2012 14:07:23
%S 1,7,60,704,9189,126759,1802312,26152418,385221143,5741256764,
%T 86383382827,1309998125640,19998172734786,307022182222506,
%U 4736694001644862,73390033697855860,1141388483146794007,17810678207278478530
%N Number of one-sided polyominoes with 2n cells.
%C Sequence related with polydominoes and other similar sequences. It appears that we can write A216492(n) < A216583(n) < A056785(n) < A056786(n) < A210996(n) < a(n) < A210986(n), if n >= 3. - _Omar E. Pol_, Sep 16 2012
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Polyomino.html">Polyomino</a>
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Polyomino">Polyomino</a>
%Y Bisection of A000988.
%Y Cf. A210989, A210996.
%K nonn
%O 1,2
%A _Omar E. Pol_, Sep 16 2012