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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. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 2 03:47 EDT 2022. Contains 354985 sequences. (Running on oeis4.)