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A147134 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1001-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 13, 31, 81, 343, 1923, 13549, 94903, 802247, 8564607, 113354205, 1800337015, 33663851515, 758043047263, 20744856409045 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.1.1.1
.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.1
.0.0.1.0.0.0.1.1
.0.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.0
CROSSREFS
Sequence in context: A147030 A146259 A146174 * A146842 A146191 A058264
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified May 24 01:38 EDT 2024. Contains 372768 sequences. (Running on oeis4.)