A146776 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0010-1010-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 27, 551, 1025, 9065, 24039, 430341, 1208611, 88984447, 322624067, 42836270201, 190686627801, 27661973527585, 149211196626477, 36642661396277021

Offset

1,7

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A000797 A171168 A147202 * A147218 A146856 A217409

Adjacent sequences: A146773 A146774 A146775 * A146777 A146778 A146779

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved