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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. 0
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

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Last modified December 2 17:08 EST 2021. Contains 349445 sequences. (Running on oeis4.)