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A262589
Number of other isonemal fabrics of exact period n.
2
0, 0, 2, 0, 4, 0, 40, 0, 64, 0, 316, 6, 448, 90, 3529, 14, 3836, 0
OFFSET
2,3
REFERENCES
B. Grünbaum and G. C. Shephard, The geometry of fabrics, pp. 77-97 of F. C. Holroyd and R. J. Wilson, editors, Geometrical Combinatorics. Pitman, Boston, 1984. [gives different a(10) which is probably erroneous]
LINKS
Branko Grünbaum and G. C. Shephard, A catalogue of isonemal fabrics, Discrete Geometry and Convexity, 440 (1985), 279-298.
B. Grünbaum and G. C. Shephard, An extension to the catalogue of isonemal fabrics, Discrete Mathematics, 60, (1986), 155-192.
FORMULA
A005441(n) = A000046(n) + A193140(n) + a(n).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 21 2015
EXTENSIONS
a(14)-a(19) using formula added, a(10) corrected by Andrey Zabolotskiy, Apr 14 2023
STATUS
approved