A147196 - OEIS

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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.

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

Table of n, a(n) for n=1..22.

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

Adjacent sequences: A147193 A147194 A147195 * A147197 A147198 A147199

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved