%I
%S 0,4,67,1455,41829,1540566,68342769,3540690574,209612913688,
%T 13957423185476,1032436318249157,83993175608836193,
%U 7453446303042081363,716451740543945322472,74159075140708643215135
%N Number of 2element sets of mapping patterns from n points to themselves; the number of 2element sets of transformations on n points up to conjugation.
%H J. D. Mitchell, <a href="http://wwwgroups.mcs.standrews.ac.uk/~jamesm/data.php">Semigroups data</a> (contains links to files containing the 2element sets of transformations on n points up to conjugation)
%F a(n) = A054745(n)  A001372(n). [_James Mitchell_, Oct 29 2013]
%Y Cf. A001372, A224539.
%K nonn
%O 1,2
%A _James Mitchell_, Jul 26 2013
%E Added more terms, _James Mitchell_, Oct 29 2013
