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A147409 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1001-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 31, 61, 147, 365, 1043, 3041, 10027, 33377, 115807, 406723, 1580475, 6700609 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 10 X 10 example

.0.0.0.1.0.0.1.0.0.0

.0.0.0.1.0.0.1.0.0.0

.0.0.0.1.1.1.1.0.0.0

.1.1.1.0.0.0.0.1.1.1

.0.0.1.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.1.0.0

.1.1.1.0.0.0.0.1.1.1

.0.0.0.1.1.1.1.0.0.0

.0.0.0.1.0.0.1.0.0.0

.0.0.0.1.0.0.1.0.0.0

CROSSREFS

Sequence in context: A011898 A098577 A004136 * A147342 A172310 A060939

Adjacent sequences:  A147406 A147407 A147408 * A147410 A147411 A147412

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified November 11 15:36 EST 2019. Contains 329016 sequences. (Running on oeis4.)