OFFSET
0,2
LINKS
James East, A. Vernitski, Ranks of ideals in inverse semigroups of difunctional binary relations, arXiv preprint arXiv:1612.04935 [math.GR], 2016.
FORMULA
a(n) = A000110(n) + n for n >= 3 (see Theorem 2.3 of the East-Vernistki paper). - James East, Feb 27 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 13 2017
EXTENSIONS
More terms from James East, Feb 27 2018
STATUS
approved