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A225772
Number of 2-element sets of mapping patterns from n points to themselves; the number of 2-element sets of transformations on n points up to conjugation.
0
0, 4, 67, 1455, 41829, 1540566, 68342769, 3540690574, 209612913688, 13957423185476, 1032436318249157, 83993175608836193, 7453446303042081363, 716451740543945322472, 74159075140708643215135
OFFSET
1,2
LINKS
J. D. Mitchell, Semigroups data (contains links to files containing the 2-element sets of transformations on n points up to conjugation)
FORMULA
a(n) = A054745(n) - A001372(n). [James Mitchell, Oct 29 2013]
CROSSREFS
Sequence in context: A225940 A003360 A367121 * A329478 A241001 A308382
KEYWORD
nonn
AUTHOR
James Mitchell, Jul 26 2013
EXTENSIONS
Added more terms, James Mitchell, Oct 29 2013
STATUS
approved