A146999 - OEIS

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A146999

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 3, 5, 7, 13, 19, 53, 121, 389, 940, 3064, 7695, 29728, 97515, 493327, 1920641, 10778992, 46183271, 290012194, 1476840183, 11445253811

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.1.0

.0.0.0.0.1.0.0.1

.1.0.0.0.1.0.0.1

.1.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.1

.1.0.0.1.0.0.0.1

.1.0.0.1.0.0.0.0

.0.1.1.1.1.1.0.0

CROSSREFS

Sequence in context: A108310 A252398 A330383 * A147485 A341650 A341640

Adjacent sequences: A146996 A146997 A146998 * A147000 A147001 A147002

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved