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A239820
Number of 2Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4
1
5, 23, 132, 729, 3951, 21602, 118253, 646306, 3532732, 19315270, 105601487, 577330665, 3156353205, 17256335056, 94343160597, 515789128277, 2819903064231, 15416868881838, 84286524854294, 460808121256380, 2519312876415017
OFFSET
1,1
COMMENTS
Row 2 of A239819
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) -28*a(n-2) +74*a(n-3) -181*a(n-4) +236*a(n-5) -261*a(n-6) +234*a(n-7) +200*a(n-8) -279*a(n-9) +104*a(n-10) -268*a(n-11) -36*a(n-12) +156*a(n-13) +104*a(n-14) -32*a(n-15) -16*a(n-16)
EXAMPLE
Some solutions for n=5
..3..0..0..0..0....3..2..3..2..3....3..0..0..2..3....3..0..2..0..2
..2..0..3..0..3....2..0..1..2..2....2..3..2..0..1....1..0..2..0..1
CROSSREFS
Sequence in context: A186755 A009321 A078509 * A077240 A281231 A356010
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 27 2014
STATUS
approved