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A301526 Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
1, 5, 24, 92, 391, 1728, 7640, 33824, 150119, 667154, 2966513, 13194447, 58695455, 261128908, 1161781427, 5168968740, 22997926659, 102323706303, 455266100243, 2025606769591, 9012502023966, 40099210902427, 178412956961941 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A301531.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +9*a(n-2) -3*a(n-3) -26*a(n-4) -39*a(n-5) -45*a(n-6) -20*a(n-7) +31*a(n-8) +40*a(n-9) -10*a(n-10) -34*a(n-11) +2*a(n-12) +32*a(n-13) +20*a(n-14) +14*a(n-15) +a(n-16) -3*a(n-17) -2*a(n-18) -a(n-20) for n>21

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301531.

Sequence in context: A145914 A066316 A271458 * A180354 A212349 A268370

Adjacent sequences:  A301523 A301524 A301525 * A301527 A301528 A301529

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 23 2018

STATUS

approved

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Last modified September 23 06:43 EDT 2021. Contains 347609 sequences. (Running on oeis4.)