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A146733 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 51, 221, 1241, 9517, 82699, 831417, 10562039, 171512909, 3474881423, 89012624955, 2811600551097, 108083175359051, 5158385898284233, 309138121525742883 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.1.0.0.0

.0.1.0.0.1.0.0.1

.1.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.1

.1.0.0.1.0.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A083012 A233329 A070313 * A146709 A146400 A146408

Adjacent sequences:  A146730 A146731 A146732 * A146734 A146735 A146736

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 22 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)