A146929 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111-1001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 7, 11, 16, 28, 59, 128, 309, 746, 1962, 5226, 15414, 47005, 157387, 544191, 2059429, 7980929, 34126004, 149438343, 727180335

Offset

1,10

Links

Table of n, a(n) for n=1..30.

Example

Maximal 10 X 10 example
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.1.1.1.0.0.0
.0.0.0.1.0.0.1.0.0.0
.1.1.1.0.0.0.0.1.1.1
.0.1.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.0.1.0
.1.1.1.0.0.0.0.1.1.1
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.1.1.1.0.0.0
.0.0.0.1.0.0.1.0.0.0

Crossrefs

Sequence in context: A237821 A120118 A108895 * A146921 A153535 A116615

Adjacent sequences: A146926 A146927 A146928 * A146930 A146931 A146932

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved