Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A139010
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A139010 Number of n X n symmetric binary matrices containing no more than two 1s in any 3 X 3 sub-block. +0
1
1, 2, 5, 10, 46, 298, 1984, 21540, 331078, 6336017, 173488605, 6651795802, 340061007958, 23986915555236, 2342976613039703, 311875652121439248, 56925380854171209808, 14298682300093479646164, 4921580523122987792169589 (list; graph; listen)
OFFSET

0,2

CROSSREFS

Sequence in context: A103036 A018439 A018451 this_sequence A018472 A082593 A124664

Adjacent sequences: A139007 A139008 A139009 this_sequence A139011 A139012 A139013

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), May 31 2008

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


AT&T Labs Research