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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

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

Cf. A001372, A224539.

Sequence in context: A048828 A225940 A003360 * A241001 A083931 A133881

Adjacent sequences:  A225769 A225770 A225771 * A225773 A225774 A225775

KEYWORD

nonn

AUTHOR

James Mitchell, Jul 26 2013

EXTENSIONS

Added more terms, James Mitchell, Oct 29 2013

STATUS

approved

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Last modified September 22 00:25 EDT 2017. Contains 292326 sequences.