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A206993 Number of nX7 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically 1
81, 6561, 80070, 2371090, 60684900, 1482397764, 37849652838, 954576893140, 24031904480250, 606711286710758, 15303296459686032, 385968153194641688, 9736392679516458222, 245594233526815556440, 6194918451958959626262 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A206994

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..0..0..1..1..1..0..0....0..1..1..1..0..1..0....1..0..1..0..1..0..0

..1..0..0..1..1..0..1....1..0..0..1..1..1..0....1..1..0..0..1..1..1

..0..0..1..0..0..1..0....0..1..0..0..1..0..1....0..1..0..1..0..1..1

..1..1..0..0..1..1..0....0..0..1..1..0..1..0....0..0..1..1..1..0..0

CROSSREFS

Sequence in context: A228974 A178513 A016948 * A223791 A206935 A206870

Adjacent sequences:  A206990 A206991 A206992 * A206994 A206995 A206996

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2012

STATUS

approved

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Last modified February 18 02:15 EST 2019. Contains 320237 sequences. (Running on oeis4.)