OFFSET
2,2
LINKS
Fack, V.; Lievens, S.; Van der Jeugt, J. On the diameter of the rotation graph of binary coupling trees. Discrete Math. 245 (2002), no. 1-3, 1--18. MR1887046 (2003i:05047).
FORMULA
For n > 1, a(n) is bounded by (1/4)*n*log_2(n/e) < (1/4)*log_2(n!) < a(n) < ((n-2)*ceiling(log_2(n)))+n+1 (Fack et al. 2002). - Martin R. Smith, Jul 03 2020
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Apr 14 2012
STATUS
approved