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A300346 Number of nX4 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
2, 15, 26, 58, 152, 325, 729, 1609, 3577, 7931, 17605, 39106, 86859, 192976, 428779, 952794, 2117289, 4705103, 10455942, 23235911, 51636607, 114750985, 255009010, 566702101, 1259372546, 2798682776, 6219466851, 13821419716, 30715116147 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A300350.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -8*a(n-2) +4*a(n-3) +a(n-5) -3*a(n-6) +4*a(n-7) -2*a(n-8) +a(n-9) -a(n-10) -a(n-12) +a(n-13) for n>16

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300350.

Sequence in context: A023651 A116028 A175828 * A338457 A153080 A075312

Adjacent sequences:  A300343 A300344 A300345 * A300347 A300348 A300349

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 03 2018

STATUS

approved

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Last modified May 20 10:33 EDT 2022. Contains 353871 sequences. (Running on oeis4.)