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A303965 Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 5 king-move adjacent elements, with upper left element zero. 2
5, 21, 26, 73, 173, 374, 842, 1923, 4326, 9786, 22216, 50282, 113823, 257876, 584048, 1322693, 2995970, 6785755, 15368972, 34809869, 78842537, 178572968, 404456933, 916071309, 2074845102, 4699397535, 10643852519, 24107680509, 54602433896 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A303969.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +2*a(n-3) -a(n-4) -2*a(n-5) +7*a(n-6) -8*a(n-7) -2*a(n-8) -11*a(n-9) +a(n-10) +6*a(n-11) -12*a(n-12) +4*a(n-13) +4*a(n-14) +18*a(n-15) +7*a(n-16) -3*a(n-17) +6*a(n-18) +8*a(n-19) +2*a(n-20) -6*a(n-21) -10*a(n-22) -5*a(n-23) +a(n-24) -6*a(n-25) -6*a(n-26) -7*a(n-27) +a(n-28) +5*a(n-29) +2*a(n-32) +4*a(n-33) +2*a(n-34) -a(n-35) -a(n-36) for n>37

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303969.

Sequence in context: A042319 A302305 A351325 * A304351 A305914 A303036

Adjacent sequences:  A303962 A303963 A303964 * A303966 A303967 A303968

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 03 2018

STATUS

approved

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Last modified August 13 17:37 EDT 2022. Contains 356107 sequences. (Running on oeis4.)