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A305519 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero. 1
8, 128, 1482, 16480, 186237, 2102155, 23747613, 268359015, 3032800805, 34276734724, 387403233851, 4378561680838, 49488189296483, 559335597308662, 6321843211366946, 71452123170486735, 807581990796222475 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A305523.
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) +31*a(n-2) -117*a(n-3) -700*a(n-4) -714*a(n-5) +564*a(n-6) +2057*a(n-7) +1648*a(n-8) -216*a(n-9) -1318*a(n-10) -705*a(n-11) -6*a(n-12) -165*a(n-13) -278*a(n-14) -212*a(n-15) for n>17
EXAMPLE
Some solutions for n=5
..0..0..1..0. .0..0..1..0. .0..0..0..0. .0..0..0..1. .0..0..1..1
..0..1..1..1. .0..0..1..1. .1..0..0..1. .0..0..0..0. .1..1..0..1
..0..0..1..0. .1..1..1..0. .0..0..0..1. .0..0..1..1. .0..1..0..0
..0..1..1..1. .1..1..1..0. .1..0..0..0. .1..0..1..1. .1..1..0..0
..1..0..1..1. .0..1..1..1. .1..1..0..1. .1..1..0..0. .1..1..0..0
CROSSREFS
Cf. A305523.
Sequence in context: A105094 A208711 A242355 * A316956 A036294 A298966
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 04 2018
STATUS
approved

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Last modified February 24 11:15 EST 2024. Contains 370303 sequences. (Running on oeis4.)