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A298898 Number of nX4 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, 2, 2, 4, 10, 24, 56, 142, 346, 874, 2210, 5640, 14440, 37224, 96128, 249108, 646710, 1681772, 4378614, 11411374, 29760404, 77658384, 202729956, 529406180, 1382821596, 3612643922, 9439431124, 24666860228, 64464076954, 168480273482 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A298902.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +5*a(n-2) +4*a(n-3) -6*a(n-4) -18*a(n-5) -16*a(n-6) -12*a(n-7) -3*a(n-8) +9*a(n-9) +22*a(n-10) +19*a(n-11) +14*a(n-12) +3*a(n-13) -a(n-14) -2*a(n-15) -2*a(n-16)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A298902.

Sequence in context: A217212 A025244 A132824 * A078801 A002420 A284016

Adjacent sequences:  A298895 A298896 A298897 * A298899 A298900 A298901

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 28 2018

STATUS

approved

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Last modified October 18 20:10 EDT 2018. Contains 316325 sequences. (Running on oeis4.)