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A304145 Number of nX4 0..1 arrays with every element unequal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero. 1
2, 33, 25, 61, 157, 117, 244, 936, 733, 1513, 5788, 5148, 9643, 36537, 36384, 63504, 232477, 257097, 425332, 1489062, 1805221, 2880515, 9586350, 12586970, 19638585, 61988663, 87180006, 134415114, 402438825, 600295543, 921874148, 2622349354 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A304149.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +4*a(n-3) -26*a(n-4) +29*a(n-6) +55*a(n-7) -18*a(n-8) -111*a(n-9) -15*a(n-10) +60*a(n-11) +72*a(n-12) -14*a(n-13) -36*a(n-14) -13*a(n-15) +5*a(n-16) +6*a(n-17) for n>22

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304149.

Sequence in context: A012604 A012731 A073402 * A305485 A078732 A305085

Adjacent sequences:  A304142 A304143 A304144 * A304146 A304147 A304148

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 07 2018

STATUS

approved

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Last modified June 29 09:21 EDT 2022. Contains 354910 sequences. (Running on oeis4.)