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A147196 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation. 0
1, 1, 1, 3, 5, 13, 27, 85, 297, 1599, 7901, 42229, 268975, 2452217, 25491849, 280714479, 3504622659, 56285411319, 1100845720891, 24390611734773, 611823250262071, 18446369972491401 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.0.0.0.1
.0.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.0
.1.0.0.0.1.1.0.0
.0.0.0.1.0.0.0.1
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
.1.1.0.0.1.1.0.0
CROSSREFS
Sequence in context: A005198 A160823 A077443 * A110225 A065047 A282565
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified July 25 14:35 EDT 2024. Contains 374609 sequences. (Running on oeis4.)