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A304053 Number of nX3 0..1 arrays with every element unequal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. 1
1, 11, 6, 18, 32, 60, 124, 288, 598, 1266, 2910, 6362, 13924, 31578, 70292, 156670, 353098, 791762, 1776560, 3999190, 8991152, 20221266, 45520396, 102442546, 230580304, 519141320, 1168761696, 2631446768, 5925181452, 13341570650 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A304058.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +7*a(n-3) -3*a(n-4) -11*a(n-5) -21*a(n-6) -8*a(n-7) +13*a(n-8) +25*a(n-9) +22*a(n-10) +4*a(n-11) +3*a(n-12) -6*a(n-13) -6*a(n-14) -9*a(n-15) for n>18

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304058.

Sequence in context: A122098 A115943 A122088 * A190624 A241308 A038320

Adjacent sequences:  A304050 A304051 A304052 * A304054 A304055 A304056

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 05 2018

STATUS

approved

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Last modified October 30 05:44 EDT 2020. Contains 338077 sequences. (Running on oeis4.)