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A298234 Number of nX2 0..1 arrays with every element equal to 0, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero. 8
1, 5, 13, 42, 127, 389, 1192, 3645, 11161, 34154, 104539, 319953, 979264, 2997185, 9173317, 28076298, 85931623, 263006381, 804969688, 2463728085, 7540602049, 23079121226, 70637043811, 216195058137, 661696762096, 2025220228025 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 2 of A298240.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +5*a(n-2) +4*a(n-3)
EXAMPLE
Some solutions for n=5
..0..1. .0..0. .0..0. .0..1. .0..0. .0..1. .0..0. .0..0. .0..0. .0..0
..0..0. .0..0. .1..0. .0..0. .0..1. .1..1. .0..0. .0..0. .0..1. .1..0
..1..0. .0..1. .1..1. .1..0. .1..1. .0..0. .0..1. .0..0. .0..0. .1..1
..0..0. .0..0. .0..0. .1..1. .1..1. .0..0. .1..1. .1..1. .0..0. .0..1
..1..0. .0..0. .0..1. .1..1. .1..1. .0..1. .1..1. .1..1. .0..1. .1..1
CROSSREFS
Cf. A298240.
Sequence in context: A211383 A066873 A105262 * A129789 A093576 A147259
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 15 2018
STATUS
approved

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Last modified April 22 01:34 EDT 2024. Contains 371887 sequences. (Running on oeis4.)