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A317233

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

4, 12, 28, 60, 211, 597, 1619, 4792, 13802, 39400, 113525, 326899, 940153, 2704316, 7781698, 22393110, 64428105, 185379093, 533427975, 1534875554, 4416403250, 12707841186, 36565665643, 105214062105, 302743695225, 871117391912

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 3 of A317238.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +11*a(n-3) +a(n-4) -18*a(n-5) -48*a(n-6) -31*a(n-7) +19*a(n-8) +50*a(n-9) +34*a(n-10) +2*a(n-11) -4*a(n-12) -3*a(n-13) for n>14

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317238.

Sequence in context: A028399 A173033 A339124 * A309917 A377322 A034508

Adjacent sequences: A317230 A317231 A317232 * A317234 A317235 A317236

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 24 2018

STATUS

approved

URL: https://oeis.org/A317233

⇱ A317233 - OEIS