A146243 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-010 pattern in any orientation.

1, 1, 3, 5, 11, 29, 171, 783, 4399, 33371, 348951, 4490023, 67743969, 1262306965, 30412318737, 938946971693, 36229300537639, 1709400162886171, 100764547585566691, 7519118775918147695, 708647258526428184031

Offset

1,3

Links

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

Example

Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.1.0.0.0.1.1
.0.0.0.1.1.0.0.0
.0.0.0.1.1.1.0.0
.0.1.0.0.1.0.1.0
.1.1.1.0.0.1.1.1
.0.1.1.0.0.0.1.1

Crossrefs

Sequence in context: A037152 A084748 A265784 * A262936 A214089 A108259

Adjacent sequences: A146240 A146241 A146242 * A146244 A146245 A146246

Keyword

nonn

Author

R. H. Hardin

Status

approved