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A140178 Half the number of n X n symmetric binary matrices with adjacent rows differing in at most three positions. 0
1, 4, 32, 427, 7396, 130612, 2097152, 30417025, 409957616, 5282779354 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Sequence in context: A298694 A222685 A322735 * A088991 A009668 A005121

Adjacent sequences:  A140175 A140176 A140177 * A140179 A140180 A140181

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 15 2008

STATUS

approved

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Last modified November 18 10:08 EST 2019. Contains 329261 sequences. (Running on oeis4.)