A146998 - OEIS

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A146998

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 3, 8, 23, 61, 183, 609, 3021, 17551, 122559, 936997, 8112490, 77983308, 921842339, 13073413646, 221502161483, 4341535999765, 98829117614873, 2578684019463460, 79032276911025441

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.1.1.0.0

.1.0.0.1.0.0.0.0

.1.0.0.1.0.0.0.1

.1.1.1.0.0.0.0.1

.1.0.0.0.0.1.1.1

.1.0.0.0.1.0.0.1

.0.0.0.0.1.0.0.1

.0.0.1.1.1.1.1.0

CROSSREFS

Sequence in context: A071618 A318861 A318819 * A261329 A375468 A248870

Adjacent sequences: A146995 A146996 A146997 * A146999 A147000 A147001

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved