A051738 Number of rooted 2-dimensional polyominoes with n pentagonal cells, with no symmetries removed.

1, 5, 30, 180, 1075, 6366, 37520, 220500, 1293615, 7581240, 44398387, 259881960, 1520633270, 8895116230

Offset: 1

Author

Richard C. Schroeppel, Feb 13 2002

Keywords

• nonn

Comments

Number of polypents (like polyominoes, with pentagons) with n cells. These are anchored polypents, with no culling for reflection or rotation (or translation) isomorphism.

References

• Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.

Links

• R. C. Schroeppel, A few mathematical experiments

Crossrefs

A row of A094166.

Extensions

More terms from N. J. A. Sloane, May 06 2004

Edited by N. J. A. Sloane, Sep 15 2008 at the suggestion of R. J. Mathar