A147110 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 3, 11, 27, 61, 281, 1727, 11625, 76357, 665913, 7707541, 106860049, 1716071101, 33302211687, 805167504153, 23719115504823

Offset

1,6

Links

Table of n, a(n) for n=1..20.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.1
.0.0.0.0.1.1.1.1
.0.0.0.1.0.1.0.0
.0.0.0.1.1.0.0.0
.0.0.0.1.0.0.0.0
.0.1.1.1.0.0.0.0

Crossrefs

Sequence in context: A219621 A033960 A147173 * A372612 A147118 A147157

Adjacent sequences: A147107 A147108 A147109 * A147111 A147112 A147113

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved