login
A147142
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.
0
1, 1, 1, 3, 7, 17, 39, 127, 681, 3913, 21369, 147701, 1344439, 15252227, 199338371, 3018576265, 55990200331, 1283966558111, 35424143775231
OFFSET
1,4
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.0.0.1.1.0
.0.0.0.0.0.0.1.1
.0.0.0.0.1.1.0.1
.1.0.0.1.0.1.1.0
.1.1.0.1.1.0.1.1
.0.1.1.0.1.1.0.1
.0.0.1.1.0.1.1.0
CROSSREFS
Sequence in context: A229514 A077927 A005197 * A298371 A367396 A106472
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved