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A146183 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-100 pattern in any orientation. 0
1, 1, 1, 1, 5, 17, 43, 197, 1293, 11263, 110807, 1310257, 21564593, 459131585, 12523288493, 440243859565, 19398701026043, 1090842898014815, 79649624560507867, 7542069381975617255, 913933732625520247505 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.0.0.0

.0.0.1.1.0.0.0.0

.1.1.0.1.0.0.0.0

.1.1.1.0.0.0.0.1

.1.0.0.0.0.1.1.1

.0.0.0.0.1.0.1.1

.0.0.0.0.1.1.0.0

.0.0.0.1.1.1.0.0

CROSSREFS

Sequence in context: A089527 A146778 A146858 * A163424 A294102 A190969

Adjacent sequences: A146180 A146181 A146182 * A146184 A146185 A146186

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified November 29 18:13 EST 2022. Contains 358431 sequences. (Running on oeis4.)