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A146408 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 53, 267, 1477, 11799, 115813, 1314119, 18659927, 340219403, 7888629683, 233265020067, 8619893688875, 395425329029435, 22778671927694919, 1657248108130816043 (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

.0.0.0.0.1.1.0.0

.0.0.0.1.1.0.0.0

.0.0.0.0.1.0.1.0

.0.1.0.0.1.0.1.0

.1.1.1.1.0.1.1.0

.1.0.0.0.1.0.1.1

.0.0.1.1.1.1.0.0

.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A146733 A146709 A146400 * A050894 A146464 A001354

Adjacent sequences:  A146405 A146406 A146407 * A146409 A146410 A146411

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 26 06:55 EDT 2021. Contains 348257 sequences. (Running on oeis4.)