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A298897 Number of nX3 0..1 arrays with every element equal to 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero. 1
0, 1, 1, 2, 3, 7, 12, 25, 47, 96, 187, 377, 746, 1497, 2981, 5970, 11919, 23851, 47668, 95357, 190659, 381352, 762615, 1525285, 3050426, 6100941, 12201649, 24403442, 48806507, 97613247, 195225884, 390452145, 780903303, 1561807216, 3123612835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 3 of A298902.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +a(n-2) -2*a(n-3) +a(n-4) -2*a(n-5)

EXAMPLE

All solutions for n=5

..0..0..0. .0..0..0. .0..0..0

..0..0..0. .0..0..0. .0..0..0

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

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

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

CROSSREFS

Cf. A298902.

Sequence in context: A090596 A355385 A321838 * A054272 A259593 A129016

Adjacent sequences:  A298894 A298895 A298896 * A298898 A298899 A298900

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 28 2018

STATUS

approved

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Last modified September 25 12:12 EDT 2022. Contains 356984 sequences. (Running on oeis4.)