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A262589 Number of other isonemal fabrics of exact period n. 2

%I #30 Apr 14 2023 10:52:51

%S 0,0,2,0,4,0,40,0,64,0,316,6,448,90,3529,14,3836,0

%N Number of other isonemal fabrics of exact period n.

%D 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]

%H Branko Grünbaum and G. C. Shephard, <a href="https://doi.org/10.1111/j.1749-6632.1985.tb14560.x">A catalogue of isonemal fabrics</a>, Discrete Geometry and Convexity, 440 (1985), 279-298.

%H B. Grünbaum and G. C. Shephard, <a href="https://doi.org/10.1016/0012-365X(86)90010-5">An extension to the catalogue of isonemal fabrics</a>, Discrete Mathematics, 60, (1986), 155-192.

%F A005441(n) = A000046(n) + A193140(n) + a(n).

%Y Cf. A000046, A005441, A193140.

%K nonn,more

%O 2,3

%A _N. J. A. Sloane_, Oct 21 2015

%E a(14)-a(19) using formula added, a(10) corrected by _Andrey Zabolotskiy_, Apr 14 2023

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)