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A147459 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11000-01111-11000 pattern in any orientation. 0
1, 1, 1, 1, 1, 9, 17, 31, 97, 415, 1502, 7931, 40536, 274361, 1932218, 18327587, 174386942 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.1.0.1.1.0.0.0
.0.1.0.0.1.1.1.1
.0.1.0.1.1.0.0.0
.1.1.1.0.0.1.0.1
.1.0.1.0.0.1.1.1
.0.0.0.1.1.0.1.0
.1.1.1.1.0.0.1.0
.0.0.0.1.1.0.1.0
CROSSREFS
Sequence in context: A352789 A285009 A228260 * A188559 A014004 A090994
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified April 14 03:49 EDT 2024. Contains 371655 sequences. (Running on oeis4.)