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A139008 Number of x X n symmetric binary matrices containing no more than three 1s in any 2 X 2 sub-block. 1
1, 2, 7, 49, 648, 16475, 801489, 74700792, 13333992705, 4558747755857, 2985167883475040, 3743977846899435969, 8993695705522239110137, 41379357418095833391759776, 364644672948881035681654421967 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, May 31 2008, Table of n, a(n) for n = 0..23

CROSSREFS

Sequence in context: A045598 A293043 A186860 * A058721 A324513 A086902

Adjacent sequences:  A139005 A139006 A139007 * A139009 A139010 A139011

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 31 2008

STATUS

approved

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Last modified March 29 02:19 EDT 2020. Contains 333104 sequences. (Running on oeis4.)