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A298189
Number of nX2 0..1 arrays with every element equal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.
8
2, 8, 26, 88, 298, 1012, 3440, 11700, 39804, 135432, 460832, 1568112, 5336024, 18157728, 61788368, 210258064, 715482384, 2434699680, 8284988960, 28192819392, 95936772448, 326461301312, 1110908566656, 3780288336704, 12863866903872
OFFSET
1,1
COMMENTS
Column 2 of A298195.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) -2*a(n-2) +2*a(n-3) -6*a(n-4) -4*a(n-5)
EXAMPLE
Some solutions for n=7
..0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..0. .0..0
..0..0. .0..1. .1..0. .1..1. .1..1. .1..1. .0..1. .1..0. .0..1. .0..1
..1..1. .1..0. .1..0. .0..0. .0..0. .0..1. .1..0. .1..1. .1..0. .1..0
..0..1. .1..1. .1..0. .1..0. .1..0. .0..1. .1..0. .0..0. .1..1. .1..0
..0..0. .0..0. .1..1. .0..1. .0..1. .0..1. .0..1. .1..0. .0..0. .1..0
..0..1. .1..0. .1..0. .1..1. .1..0. .1..1. .1..0. .0..1. .1..1. .1..0
..1..0. .0..1. .0..1. .1..0. .1..1. .1..0. .1..0. .1..0. .0..0. .1..0
CROSSREFS
Cf. A298195.
Sequence in context: A230904 A289595 A343485 * A053956 A320802 A052543
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 14 2018
STATUS
approved