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A146276 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-111 pattern in any orientation. 0
1, 1, 1, 1, 3, 5, 11, 23, 41, 95, 251, 683, 2475, 8891, 33925, 147349, 637035, 3134145, 16878377, 99607453, 667424329, 4848478029, 38002637893, 331471680853, 3049547921723, 31341827546071 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.1.1.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A056874 A280773 A109927 * A155753 A133914 A169913

Adjacent sequences:  A146273 A146274 A146275 * A146277 A146278 A146279

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified January 18 21:54 EST 2019. Contains 319282 sequences. (Running on oeis4.)