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A184089
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Number of (n+1)X4 0..3 arrays with rows and columns in nondecreasing order and with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one
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1
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684, 1146, 9483, 40401, 235003, 1025854, 4969133, 22190358, 100488243, 437074150, 1877449556, 7754457028, 30996990781, 118227838313, 431216031421, 1495925257951, 4946248543125, 15573619100906, 46781648655093
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for 3X4
..2..2..3..3....1..1..1..2....1..1..3..3....1..1..1..3....1..1..2..2
..2..3..1..3....1..2..2..1....1..2..0..1....2..3..3..2....1..3..0..2
..3..2..3..3....3..0..2..2....1..2..3..3....3..0..3..0....2..0..2..1
...
...9..9..10.......5..6..6.......5..6..7.......7..8..9.......6..6..6...
...10..9..10.......6..6..7.......6..7..7.......8..9..8.......6..5..5...
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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