A147335 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 43, 105, 255, 713, 2327, 7879, 28233, 105483, 441751, 1976665, 9809483, 52365589, 307831711

Offset

1,10

Links

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

Example

Maximal 10 X 10 example
.0.0.0.0.0.0.1.0.0.0
.0.0.0.0.0.1.1.1.0.0
.0.0.0.1.1.1.0.0.1.0
.0.0.1.0.1.0.0.0.1.1
.0.0.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1.0.0
.1.1.0.0.0.1.0.1.0.0
.0.1.0.0.1.1.1.0.0.0
.0.0.1.1.1.0.0.0.0.0
.0.0.0.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A146369 A146377 A147501 * A147464 A146058 A155354

Adjacent sequences: A147332 A147333 A147334 * A147336 A147337 A147338

Keyword

nonn

Author

R. H. Hardin

Status

approved