OFFSET
0,2
FORMULA
E.g.f.: log(A(x + exp(x) - 1)) + 1 where A(x) is the e.g.f. for A001035.
EXAMPLE
a(2) = 9. There are 13 transitive relations on the set {1,2}. Four of these are not connected: {}, {(1,1)}, {(2,2)}, {(1,1),(2,2)}. 13-4=9.
CROSSREFS
KEYWORD
nonn
AUTHOR
Geoffrey Critzer, Jul 30 2014
STATUS
approved