The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A320420 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A320420

Number of monoids of order n that are not groups.
(history; published version)

#10 by N. J. A. Sloane at Thu Jan 17 16:11:12 EST 2019

STATUS

reviewed

approved

#9 by Antti Karttunen at Thu Jan 17 15:48:53 EST 2019

STATUS

proposed

reviewed

#8 by Steve Szabo at Tue Jan 15 13:08:12 EST 2019

STATUS

editing

proposed

#7 by Joerg Arndt at Tue Jan 08 03:11:41 EST 2019

FORMULA

a(n) = A058129(n) - A000001(n).

CROSSREFS

Cf. A058129(n),, A000001(n).

KEYWORD

nonn,more,changed

Discussion

Tue Jan 15

12:59

OEIS Server: This sequence has not been edited or commented on for a week
yet is not proposed for review.  If it is ready for review, please
visit https://oeis.org/draft/A320420 and click the button that reads
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Thanks.
  - The OEIS Server

#6 by Steve Szabo at Mon Jan 07 22:16:18 EST 2019

NAME

allocated for Steve SzaboNumber of monoids of order n that are not groups.

DATA

0, 0, 1, 6, 33, 227, 2235, 31558, 1668992

OFFSET

0,4

FORMULA

a(n) = A058129(n)-A000001(n).

CROSSREFS

Cf. A058129(n),A000001(n)

KEYWORD

allocated

nonn

AUTHOR

Steve Szabo, Jan 07 2019

STATUS

approved

editing

#5 by Steve Szabo at Mon Jan 07 22:16:18 EST 2019

NAME

allocated for Steve Szabo

KEYWORD

recycled

allocated

#4 by R. J. Mathar at Mon Jan 07 07:27:48 EST 2019

STATUS

editing

approved

#3 by R. J. Mathar at Mon Jan 07 07:27:45 EST 2019

NAME

allocated for Alex Bailey

KEYWORD

allocated

recycled

STATUS

approved

editing

#2 by Alex Bailey at Fri Oct 12 16:41:48 EDT 2018

KEYWORD

allocating

allocated

#1 by Alex Bailey at Fri Oct 12 16:41:48 EDT 2018

NAME

allocated for Alex Bailey

KEYWORD

allocating

STATUS

approved