A301840 - OEIS

A301840

Number of nX7 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

64, 2778, 72514, 1986213, 54948498, 1518341751, 41966406867, 1159968653556, 32062561937804, 886245421510973, 24496909108346419, 677125561489883191, 18716618615716379268, 517351460289528901541, 14300262505893118372023

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OFFSET

1,1

COMMENTS

Column 7 of A301841.

LINKS

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

R. H. Hardin, Empirical recurrence of order 53

FORMULA

Empirical recurrence of order 53 (see link above)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301841.

Sequence in context: A284228 A017319 A036531 * A302068 A281475 A302628

Adjacent sequences: A301837 A301838 A301839 * A301841 A301842 A301843

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 27 2018

STATUS

approved