login
A146998
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 8, 23, 61, 183, 609, 3021, 17551, 122559, 936997, 8112490, 77983308, 921842339, 13073413646, 221502161483, 4341535999765, 98829117614873, 2578684019463460, 79032276911025441
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.1.1.1.1.1.0.0
.1.0.0.1.0.0.0.0
.1.0.0.1.0.0.0.1
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.1.0.0.0.1.0.0.1
.0.0.0.0.1.0.0.1
.0.0.1.1.1.1.1.0
CROSSREFS
Sequence in context: A071618 A318861 A318819 * A261329 A375468 A248870
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved