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A305512 Number of nX4 0..1 arrays with every element unequal to 1, 2, 5, 6 or 8 king-move adjacent elements, with upper left element zero. 1
2, 1, 6, 10, 13, 38, 73, 164, 351, 749, 1719, 3710, 8182, 18453, 40666, 90453, 201921, 448575, 999776, 2226884, 4957665, 11048840, 24608791, 54816139, 122135777, 272069268, 606114434, 1350348321, 3008242832, 6701882069, 14930628603 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A305516.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +5*a(n-3) -8*a(n-6) -8*a(n-7) -10*a(n-9) -a(n-10) +a(n-11) -2*a(n-12) -2*a(n-14) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A305516.

Sequence in context: A157402 A069114 A173773 * A121927 A200265 A039762

Adjacent sequences:  A305509 A305510 A305511 * A305513 A305514 A305515

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 03 2018

STATUS

approved

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Last modified December 13 22:48 EST 2019. Contains 329974 sequences. (Running on oeis4.)