A147401 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 9, 17, 35, 101, 227, 539, 1279, 5573, 17447, 78819, 285189, 1548177, 6812379, 38874621, 188648393, 1338014585

Offset

1,10

Links

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

Example

Maximal 10 X 10 example
.0.0.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.1.1.0.0
.0.0.0.0.1.1.1.0.1.1
.0.0.0.0.1.0.0.1.1.0
.0.0.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1.0.0
.0.1.1.0.0.1.0.0.0.0
.1.1.0.1.1.1.0.0.0.0
.0.0.1.1.1.0.0.0.0.0
.0.0.1.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A205539 A020737 A262452 * A062536 A324718 A099213

Adjacent sequences: A147398 A147399 A147400 * A147402 A147403 A147404

Keyword

nonn

Author

R. H. Hardin

Status

approved