A172023 Number of Sona graphs.

1, 1, 1, 3, 5, 13, 38, 133, 534

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