A147405 Number of n X n binary arrays with all ones connected only in a 1001-1001-1111 pattern in any orientation.

1, 1, 1, 9, 25, 61, 265, 2725, 40501, 485293, 5980517, 124941205, 4561553811, 214166188181, 10710509884487, 650335804942117

Offset

1,4

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.1.1.1.0.1.1.1.1
.1.0.0.0.1.0.0.1
.1.0.0.0.1.0.0.1
.1.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.1
.1.0.0.1.0.0.0.1
.1.0.0.1.0.0.0.1
.1.1.1.1.0.1.1.1

Crossrefs

Sequence in context: A147497 A147353 A049740 * A111440 A077118 A242116

Adjacent sequences: A147402 A147403 A147404 * A147406 A147407 A147408

Keyword

nonn

Author

R. H. Hardin

Status

approved