A146810 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1010-1111 pattern in any orientation.

1, 1, 1, 1, 3, 7, 19, 47, 187, 1053, 6641, 45779, 382213, 4162011, 56301753, 896342697, 17171206379, 405427693543, 11818746061515, 417444288436423

Offset

1,5

Links

Table of n, a(n) for n=1..20.

Example

Maximal 8 X 8 example
.0.1.1.1.1.0.0.0
.1.0.1.0.1.0.0.0
.1.1.0.0.1.0.0.0
.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.1
.0.0.0.1.0.0.1.1
.0.0.0.1.0.1.0.1
.0.0.0.1.1.1.1.0

Crossrefs

Sequence in context: A179467 A308153 A049117 * A246493 A293733 A073063

Adjacent sequences: A146807 A146808 A146809 * A146811 A146812 A146813

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved