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A172023 Number of Sona graphs. 1
1, 1, 1, 3, 5, 13, 38, 133, 534 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

See Table 1, column 2 of the paper by E. D. Demaine et al. for details.

LINKS

Table of n, a(n) for n=1..9.

E. D. Demaine, M. L. Demaine, P. Taslakian and G. T. Toussaint, Sand drawings and Gaussian graphs, Journal of Mathematics and the Arts, 1 (2007), 125-133.

EXAMPLE

The number of Sona graphs with nine faces is 534.

CROSSREFS

Sequence in context: A190423 A278024 A198636 * A271667 A188583 A259932

Adjacent sequences:  A172020 A172021 A172022 * A172024 A172025 A172026

KEYWORD

nonn,more

AUTHOR

Parthasarathy Nambi, Jan 22 2010

STATUS

approved

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Last modified July 11 22:31 EDT 2020. Contains 335652 sequences. (Running on oeis4.)