A210987 Number of fixed polyominoes with 2n-1 cells.

1, 6, 63, 760, 9910, 135268, 1903890, 27394666, 400795844, 5940738676, 88983512783, 1344372335524, 20457802016011, 313224032098244, 4820975409710116, 74541651404935148, 1157186142148293638, 18027932215016128134

Offset: 1

Author

Omar E. Pol, Sep 16 2012

Keywords

• nonn

Links

• Eric Weisstein's World of Mathematics, Polyomino
• Wikipedia, Polyomino

Crossrefs

Bisection of A001168.

Cf. A210986, A210989, A210997.

Formula

a(n) = A001168(2*n-1).