A301666 - OEIS

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A301666

Number of nX5 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.

3, 61, 407, 2793, 21224, 146841, 1073621, 7703565, 55506215, 399555430, 2875870497, 20706418377, 149059329261, 1073124611823, 7725565402834, 55617663607353, 400401309675815, 2882556650714509, 20752023117855145

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

OFFSET

1,1

COMMENTS

Column 5 of A301669.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301669.

Sequence in context: A105430 A141979 A185831 * A102720 A120308 A279381

Adjacent sequences: A301663 A301664 A301665 * A301667 A301668 A301669

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 25 2018

STATUS

approved