A301828 - OEIS

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A301828

Number of 7Xn 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

0, 233, 64, 1183, 19130, 147954, 2341241, 24102055, 298497818, 3505205058, 41108505612, 488703775775, 5745894085957, 68034532914313, 802101978217021, 9479073301967998, 111895780368223703, 1321526207564475140

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

OFFSET

1,2

COMMENTS

Row 7 of A301823.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

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

CROSSREFS

Cf. A301823.

Sequence in context: A139673 A252003 A151629 * A132917 A139652 A126979

Adjacent sequences: A301825 A301826 A301827 * A301829 A301830 A301831

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 27 2018

STATUS

approved