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A094168 Number of rooted 2-dimensional polyominoes with n heptagonal cells, with no symmetries removed. 1
1, 7, 42, 252, 1505, 8946, 53165, 315980, 1878597, 11171930, 66456082, 395399760, 2352979538, 14004512886 (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..14.

R. C. Schroeppel, A few mathematical experiments

CROSSREFS

A row of A094166.

Sequence in context: A053142 A214941 A162941 * A163345 A163923 A164369

Adjacent sequences:  A094165 A094166 A094167 * A094169 A094170 A094171

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 06 2004

STATUS

approved

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Last modified September 22 10:34 EDT 2020. Contains 337289 sequences. (Running on oeis4.)