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A307293 Number of color plane groups of index n. 0
17, 46, 23, 96, 14, 90, 15, 166, 40, 75, 13, 219, 16, 80, 34, 262, 14, 174, 15, 205, 38, 88, 13, 433, 31, 103, 48, 222, 14, 213, 15, 395, 36, 111, 24, 452, 16, 116, 40, 416, 14, 250, 15, 265, 62, 124, 13, 741, 32, 193, 38, 300, 14, 303, 24, 468, 42, 147, 13, 627 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Thomas W. Wieting, The Mathematical Theory of Chromatic Plane Ornaments, Marcel Dekker, Inc., 1982. See Table 11 at pages 250-254.

LINKS

Table of n, a(n) for n=1..60.

R. L. E. Schwarzenberger, Colour symmetry: Part two, Bulletin of the London Mathematical Society 16.3 (1984): 216-229. See page 221.

CROSSREFS

Sequence in context: A221752 A032698 A120099 * A045570 A058205 A329951

Adjacent sequences:  A307290 A307291 A307292 * A307294 A307295 A307296

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 08 2019

EXTENSIONS

a(1) and further terms added by Andrey Zabolotskiy, Apr 09 2019

STATUS

approved

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Last modified September 16 12:25 EDT 2021. Contains 347472 sequences. (Running on oeis4.)