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A303713 Number of nXn 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero. 1
1, 1, 5, 17, 81, 343, 1592, 7551, 34546, 158402, 734321, 3389249, 15610239, 72045856, 332515175, 1533661362, 7075164898, 32644176977, 150600651761, 694773927239, 3205360278072, 14787893322847, 68223139662242, 314745564736962 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A303719.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..70

FORMULA

Empirical: a(n) = 3*a(n-1) +2*a(n-2) +28*a(n-3) -2*a(n-4) -42*a(n-5) -56*a(n-6) +50*a(n-7) -44*a(n-8) +30*a(n-9) -44*a(n-10) +2*a(n-11) +2*a(n-12) -a(n-14) +a(n-15) for n>18

EXAMPLE

Some solutions for n=5

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

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

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

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

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

CROSSREFS

Cf. A303719.

Sequence in context: A149750 A179605 A149751 * A188231 A023253 A149752

Adjacent sequences:  A303710 A303711 A303712 * A303714 A303715 A303716

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 29 2018

STATUS

approved

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Last modified November 17 00:08 EST 2019. Contains 329209 sequences. (Running on oeis4.)