OFFSET
0,1
COMMENTS
Number of vertex guards needed to see both interior and exterior of simple orthogonal polygon with n nodes.
REFERENCES
J. O'Rourke, Art Gallery Theorems and Algorithms, Oxford Univ. Press, 1987, p. 157
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..5000
FORMULA
Empirical g.f.: -(4*x^16-x^14-x^12-x^10-x^7-x^5-x^3-5) / (x^17-x^16-x+1). - Colin Barker, Jul 30 2013
MATHEMATICA
Table[Floor[7 n / 16] + 5, {n, 0, 80}] (* Vincenzo Librandi, Oct 04 2017 *)
PROG
(Magma) [Floor(7*n/16)+5: n in [0..80]]; // Vincenzo Librandi, Oct 04 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 18 2004
STATUS
approved