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A300799 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
4, 32, 228, 1672, 12228, 89472, 654628, 4789672, 35044228, 256405472, 1876022628, 13726153672, 100429116228, 734802161472, 5376271710628, 39336162877672, 287807944468228, 2105782741357472, 15407222208518628, 112728863961361672 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A300804.
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) +3*a(n-2) -5*a(n-3)
EXAMPLE
Some solutions for n=5
..0..0..1. .0..1..1. .0..1..1. .0..1..0. .0..0..1. .0..1..1. .0..1..0
..0..1..0. .1..0..0. .1..0..0. .1..1..0. .1..0..1. .0..1..0. .0..0..1
..1..0..1. .0..1..0. .1..1..1. .0..1..0. .1..0..1. .1..0..1. .1..0..1
..1..1..0. .0..1..1. .0..0..0. .1..0..0. .1..1..1. .1..1..0. .1..0..1
..1..0..1. .1..0..0. .0..0..0. .1..0..0. .1..0..0. .1..0..1. .1..1..1
CROSSREFS
Cf. A300804.
Sequence in context: A300210 A302736 A033515 * A303457 A303451 A301438
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 13 2018
STATUS
approved

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)