A094169 Number of rooted 2-dimensional polyominoes with n octagonal cells, with no symmetries removed.

1, 8, 60, 440, 3230, 23688, 173796, 1275240, 9359748, 68708320, 504466468, 3704376384, 27205146592

Offset

1,2

References

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

Links

Table of n, a(n) for n=1..13.

Daniel J. Heath and R. Robert Rdyberg, III, On Polyominoes and Digital Cameras, Mathematics Magazine, Vol. 90, No. 2 (April 2017), pp. 135-141.

R. C. Schroeppel, A few mathematical experiments

Crossrefs

A row of A094166.

Sequence in context: A274800 A126640 A093132 * A129325 A285391 A001267

Adjacent sequences: A094166 A094167 A094168 * A094170 A094171 A094172

Keyword

nonn

Author

N. J. A. Sloane, May 06 2004

Status

approved