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A005441 Isonemal fabrics of period exactly n.
(Formerly M3230)
2
1, 1, 4, 4, 9, 8, 55, 21, 105, 62, 429, 196, 800, 698, 4674, 2070, 7721, 7154 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

REFERENCES

B. Grünbaum and G. C. Shephard, The geometry of fabrics, pp. 77-98 of F. C. Holroyd and R. J. Wilson, editors, Geometrical Combinatorics. Pitman, Boston, 1984.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=2..19.

B. Grünbaum and G. C. Shephard, An extension to the catalogue of isonemal fabrics, Discrete Mathematics, 60, (1986), 155-192.

FORMULA

a(n) = A000046(n) + A193140(n) + A262589(n).

CROSSREFS

Cf. A000046, A193140, A262589.

Sequence in context: A049723 A010661 A051668 * A198497 A231980 A175051

Adjacent sequences:  A005438 A005439 A005440 * A005442 A005443 A005444

KEYWORD

nonn,more

AUTHOR

Simon Plouffe

EXTENSIONS

a(14)-a(19) from second Grünbaum and Shephard paper added by Sean A. Irvine, Jun 26 2016

STATUS

approved

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Last modified July 28 19:33 EDT 2021. Contains 346335 sequences. (Running on oeis4.)