A147364 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01110-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 3, 6, 9, 16, 23, 72, 173, 621, 1620, 5393, 14347, 63207, 232978, 1333190, 5780677, 34593611, 163090674, 1165840626, 6871746297

Offset

1,7

Links

Table of n, a(n) for n=1..26.

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.1.0
.0.0.0.1.1.1.0.1
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.1.0.1.1.1.0.0.0
.0.1.1.1.1.1.0.0

Crossrefs

Sequence in context: A003244 A115995 A051057 * A147227 A147063 A357640

Adjacent sequences: A147361 A147362 A147363 * A147365 A147366 A147367

Keyword

nonn

Author

R. H. Hardin

Status

approved