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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. 0
1, 1, 1, 1, 3, 7, 19, 47, 187, 1053, 6641, 45779, 382213, 4162011, 56301753, 896342697, 17171206379, 405427693543, 11818746061515, 417444288436423 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 20 10:43 EDT 2021. Contains 348100 sequences. (Running on oeis4.)