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A304350 Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero. 1
3, 9, 13, 27, 60, 123, 280, 729, 2015, 5844, 17796, 55746, 176718, 565998, 1824691, 5895378, 19079961, 61831121, 200450950, 650016786, 2108377349, 6839182152, 22185876476, 71972913726, 233489826816, 757476164734, 2457387441714 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A304355.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +8*a(n-3) -14*a(n-4) -12*a(n-5) +12*a(n-6) -39*a(n-7) +6*a(n-8) -14*a(n-9) +81*a(n-10) +28*a(n-11) -71*a(n-12) -53*a(n-13) +51*a(n-14) +27*a(n-15) -20*a(n-16) -2*a(n-17) +2*a(n-18) for n>20

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304355.

Sequence in context: A107364 A014861 A018407 * A305913 A215443 A304664

Adjacent sequences:  A304347 A304348 A304349 * A304351 A304352 A304353

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 2018

STATUS

approved

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Last modified October 17 17:21 EDT 2021. Contains 348065 sequences. (Running on oeis4.)