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A144260 Number of symmetric n X n binary matrices with each element equal to one minus the sum of its horizontal and vertical neighbors, modulo two. 1
1, 1, 1, 4, 2, 1, 1, 1, 16, 1, 8, 1, 1, 4, 1, 16, 2, 1, 256, 1, 1, 1, 128, 4, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

A075462 is a(n) without the symmetry restriction.

LINKS

Table of n, a(n) for n=1..28.

CROSSREFS

Sequence in context: A068930 A204815 A247642 * A036466 A097526 A051149

Adjacent sequences:  A144257 A144258 A144259 * A144261 A144262 A144263

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 16 2008

STATUS

approved

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Last modified October 24 01:20 EDT 2018. Contains 316541 sequences. (Running on oeis4.)