A005787 Reachable configurations on n circles.

2, 8, 112, 5856, 869824

Offset: 1

Author

N. J. A. Sloane, Jeffrey Shallit

Keywords

• nonn
• nice
• hard
• more

References

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

Links

• Sean A. Irvine, Java program (github)
• D. Rubinstein, Jeffrey Shallit and M. Szegedy, A subset coloring algorithm and its application to computer graphics, Commun. ACM, 31 (1988), 1228-1232.

Extensions

a(5) from Sean A. Irvine, Apr 30 2020