OFFSET
0,3
COMMENTS
Number of maps from {0,1}^n to itself with no roots.
REFERENCES
F. Robert, Discrete Iterations, Springer-Verlag, 1986, p. 167.
MATHEMATICA
(#-1)^#&/@(2^Range[0, 5]) (* Harvey P. Dale, Feb 18 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 19 2004
STATUS
approved