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A240401
Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4
1
2, 5, 14, 24, 77, 182, 397, 1164, 2626, 6439, 17045, 39465, 100175, 251538, 602316, 1525842, 3756635, 9193532, 23052218, 56571408, 139814332, 347712483, 855278021, 2119654735, 5248572774, 12946151193, 32079791328, 79306295913, 195965663917
OFFSET
1,1
COMMENTS
Column 2 of A240406
LINKS
FORMULA
Empirical: a(n) = 3*a(n-2) +10*a(n-3) -3*a(n-4) -6*a(n-5) -3*a(n-6) +8*a(n-7) -7*a(n-8) -9*a(n-9) -4*a(n-10) +13*a(n-11) -14*a(n-12) +17*a(n-13) -a(n-15)
EXAMPLE
Some solutions for n=4
..2..1....2..2....2..2....2..1....2..1....2..1....2..2....2..1....2..1....2..2
..3..3....2..0....2..0....2..1....3..3....2..1....3..3....3..3....3..3....3..3
..3..2....2..0....2..0....2..0....2..0....2..0....3..2....3..2....2..1....3..1
..2..2....2..0....3..3....2..0....3..1....3..3....2..1....2..0....3..1....2..0
CROSSREFS
Sequence in context: A220477 A049939 A296302 * A133375 A057295 A290414
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 04 2014
STATUS
approved