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%I #16 Apr 15 2023 14:34:45
%S 1,2,12,108,1285,17073,238591,3426576,50107909,742624232,11123060678,
%T 168047007728,2557227044764,39153010938487,602621953061978,
%U 9317706529987950,144648268175306702,2253491528465905342,35218318816847951974
%N Number of free polyominoes with 2n-1 cells.
%H John Mason, <a href="/A210997/b210997.txt">Table of n, a(n) for n = 1..25</a>
%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 A000105.
%Y Cf. A000988, A210989, A210996.
%K nonn
%O 1,2
%A _Omar E. Pol_, Sep 15 2012
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