The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A196724 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A196724

Number of subsets of {1..n} (including empty set) such that the pairwise products of distinct elements are all distinct.
(history; published version)

#24 by Alois P. Heinz at Wed Oct 07 12:42:24 EDT 2020

STATUS

proposed

approved

#23 by Fausto A. C. Cariboni at Wed Oct 07 12:29:05 EDT 2020

STATUS

editing

proposed

#22 by Fausto A. C. Cariboni at Wed Oct 07 12:28:39 EDT 2020

LINKS

Fausto A. C. Cariboni, <a href="/A196724/b196724.txt">Table of n, a(n) for n = 0..50</a>

STATUS

approved

editing

#21 by Joerg Arndt at Tue Oct 06 02:20:46 EDT 2020

STATUS

reviewed

approved

#20 by Michel Marcus at Mon Oct 05 17:36:18 EDT 2020

STATUS

proposed

reviewed

#19 by Fausto A. C. Cariboni at Mon Oct 05 17:35:57 EDT 2020

STATUS

editing

proposed

#18 by Fausto A. C. Cariboni at Mon Oct 05 17:35:16 EDT 2020

DATA

1, 2, 4, 8, 16, 32, 58, 116, 212, 416, 720, 1440, 2340, 4680, 7920, 13024, 23328, 46656, 74168, 148336, 229856, 371424, 615304, 1230608, 1780224, 3401568, 5589360, 9468504, 14397744, 28795488, 40312128, 80624256, 131388480, 206363168, 335814288, 521401536

EXTENSIONS

a(33)-a(35) from Fausto A. C. Cariboni, Oct 05 2020

STATUS

approved

editing

#17 by Susanna Cuyler at Mon Jun 03 09:15:29 EDT 2019

STATUS

proposed

approved

#16 by Gus Wiseman at Mon Jun 03 05:56:30 EDT 2019

STATUS

editing

proposed

#15 by Gus Wiseman at Mon Jun 03 05:55:45 EDT 2019

CROSSREFS

The subset case is A196724 (this sequence).