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A184761 T(n,k)=Half the number of nXk binary arrays with no 1 having an adjacent 1 both above and to its left 8
1, 2, 2, 4, 7, 4, 8, 25, 25, 8, 16, 89, 163, 89, 16, 32, 317, 1056, 1056, 317, 32, 64, 1129, 6847, 12397, 6847, 1129, 64, 128, 4021, 44391, 145778, 145778, 44391, 4021, 128, 256, 14321, 287802, 1713803, 3110914, 1713803, 287802, 14321, 256, 512, 51005, 1865917 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

...1......2........4...........8.............16...............32

...2......7.......25..........89............317.............1129

...4.....25......163........1056...........6847............44391

...8.....89.....1056.......12397.........145778..........1713803

..16....317.....6847......145778........3110914.........66363023

..32...1129....44391.....1713803.......66363023.......2568513843

..64...4021...287802....20148584.....1415755252......99419347147

.128..14321..1865917...236878817....30202770902....3848174315295

.256..51005.12097367..2784890782...644326291402..148949599913987

.512.181657.78431296.32740859687.13745636657969.5765325542821919

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..760

EXAMPLE

Some solutions for 4X3

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

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

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

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

CROSSREFS

Column 2 is A007484(n-1) and 1/2 A055099 and 1/4 A104934(n+1)

Sequence in context: A301491 A347940 A208269 * A270227 A162251 A244011

Adjacent sequences: A184758 A184759 A184760 * A184762 A184763 A184764

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Jan 21 2011

STATUS

approved

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Last modified December 1 07:34 EST 2022. Contains 358454 sequences. (Running on oeis4.)