A210989 - OEIS

%I #7 Sep 17 2012 13:58:24

%S 1,2,18,196,2500,33896,476270,6849777,100203194,1485200848,

%T 22245940545,336093325058,5114451441106,78306011677182,

%U 1205243866707468,18635412907198670,289296535756895985,4506983054619138245,70436637624668665265

%N Number of one-sided polyominoes with 2n-1 cells.

%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. A210988, A210997.

%K nonn

%O 1,2

%A _Omar E. Pol_, Sep 16 2012