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A280855
Number of nX4 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.
1
11, 110, 96, 124, 216, 462, 1005, 2010, 3907, 7756, 15749, 31804, 63463, 126758, 254453, 511180, 1024877, 2052836, 4115191, 8254198, 16552251, 33182160, 66522097, 133381078, 267442273, 536212952, 1075064777, 2155474072, 4321733703
OFFSET
1,1
COMMENTS
Column 4 of A280859.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +a(n-2) +a(n-3) +2*a(n-4) +3*a(n-5) -4*a(n-6) -3*a(n-7) -4*a(n-10) +2*a(n-12) for n>16
EXAMPLE
Some solutions for n=4
..0..1..1..0. .0..1..0..1. .0..1..2..2. .0..1..1..2. .0..1..1..2
..2..0..2..0. .0..2..0..2. .2..1..0..1. .0..2..0..0. .0..2..0..2
..2..1..2..1. .1..2..1..2. .2..0..2..1. .1..2..1..2. .2..1..0..1
..0..1..0..1. .1..0..1..0. .1..1..2..0. .1..0..1..2. .0..1..2..1
CROSSREFS
Cf. A280859.
Sequence in context: A331537 A169631 A308005 * A103542 A293871 A336880
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 09 2017
STATUS
approved