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A094169 Number of rooted 2-dimensional polyominoes with n octagonal cells, with no symmetries removed. 1
1, 8, 60, 440, 3230, 23688, 173796, 1275240, 9359748, 68708320, 504466468, 3704376384, 27205146592 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 1 13:04 EDT 2020. Contains 337443 sequences. (Running on oeis4.)