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A240423
Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4
1
7, 35, 151, 684, 3140, 14357, 65592, 299916, 1371831, 6274812, 28701623, 131290186, 600577492, 2747320414, 12567582702, 57490483260, 262991159980, 1203058704494, 5503421428414, 25175545976671, 115166223186735, 526831101821167
OFFSET
1,1
COMMENTS
Column 2 of A240427
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) -20*a(n-2) +34*a(n-3) -84*a(n-4) +92*a(n-5) -68*a(n-6) +222*a(n-7) +13*a(n-8) -251*a(n-9) +25*a(n-10) -495*a(n-11) +485*a(n-12) -44*a(n-13) -180*a(n-14) +554*a(n-15) -648*a(n-16) +14*a(n-17) +152*a(n-18) -190*a(n-19) -140*a(n-20) +397*a(n-21) -273*a(n-22) +75*a(n-23) +167*a(n-24) -136*a(n-25) +27*a(n-26)
EXAMPLE
Some solutions for n=4
..0..0....2..2....3..2....2..0....0..0....3..3....2..0....2..0....2..0....0..2
..3..3....2..2....2..1....2..2....0..2....3..3....0..2....2..2....0..0....2..0
..3..2....0..0....3..1....3..2....0..0....2..1....0..2....2..1....2..2....2..0
..0..3....0..3....0..2....3..3....2..0....3..1....2..2....0..2....2..0....3..1
CROSSREFS
Sequence in context: A121163 A223621 A215510 * A094825 A022635 A336602
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 04 2014
STATUS
approved