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A240048
Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4
1
4, 10, 26, 72, 174, 597, 1187, 3115, 7269, 16520, 39181, 89951, 210684, 483773, 1131924, 2616441, 6047969, 14112456, 32543109, 75591535, 175328537, 405822918, 941534652, 2181820138, 5057085795, 11720944941, 27171466826, 62973901722
OFFSET
1,1
COMMENTS
Row 3 of A240046
FORMULA
Empirical recurrence of order 76 (see link above)
EXAMPLE
Some solutions for n=3
..2..3..2....2..3..3....3..2..2....3..2..2....3..2..2....2..3..2....2..3..3
..1..0..0....3..1..2....1..0..0....2..0..0....2..0..3....1..0..0....3..1..2
..2..0..0....3..2..2....2..0..0....2..0..0....2..1..0....1..2..0....3..1..2
CROSSREFS
Sequence in context: A099234 A087222 A130583 * A105999 A192210 A121494
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 31 2014
STATUS
approved