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A302803 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 29, 169, 1010, 6084, 36456, 218640, 1312416, 7873344, 47237760, 283440384, 1700614656, 10203632640, 61222127616, 367332102144, 2203991285760, 13223955677184, 79343718137856, 476062276976640, 2856373852962816 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A302808.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +24*a(n-3) -144*a(n-4) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302808.

Sequence in context: A273209 A273271 A200069 * A300806 A303464 A301445

Adjacent sequences:  A302800 A302801 A302802 * A302804 A302805 A302806

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 13 2018

STATUS

approved

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Last modified November 30 21:20 EST 2021. Contains 349426 sequences. (Running on oeis4.)