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A239651
Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4
1
10, 112, 1182, 12246, 127454, 1320102, 13703468, 142051652, 1473731150, 15282171258, 158517866826, 1643986061990, 17051506678146, 176848369394606, 1834236131924494, 19023918997995414, 197310588661661646
OFFSET
1,1
COMMENTS
Row 3 of A239649
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) +73*a(n-2) -446*a(n-3) -1413*a(n-4) +8070*a(n-5) +12185*a(n-6) -63420*a(n-7) -49358*a(n-8) +220534*a(n-9) +39486*a(n-10) -241802*a(n-11) +244780*a(n-12) -89648*a(n-13) -386680*a(n-14) -228008*a(n-15) +129984*a(n-16) -457816*a(n-17) -1064416*a(n-18) -330768*a(n-19) +556128*a(n-20) -351872*a(n-21) +769280*a(n-22) +407552*a(n-23) -200704*a(n-24) +32768*a(n-25)
EXAMPLE
Some solutions for n=5
..1..0..3..1..0....3..0..1..3..0....3..1..1..3..1....1..0..0..0..0
..2..1..0..1..1....2..1..2..2..1....2..0..0..3..0....2..0..0..0..1
..3..1..2..1..1....2..0..0..0..0....1..0..2..2..2....3..0..0..0..0
CROSSREFS
Sequence in context: A046164 A322724 A184131 * A014484 A110040 A298074
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 23 2014
STATUS
approved