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A165388
Number of slanted 5Xn (i=1..5)X(j=i..n+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, and 4 in the lower right corner
0
7, 168, 4569, 63740, 755947, 7834644, 74493401, 661071448, 5551999772, 44577303412
OFFSET
2,1
EXAMPLE
Some solutions for n=3
...1.2.2...........1.1.2...........1.1.2...........1.1.2........
.....2.2.2...........1.1.1...........1.2.4...........1.1.1......
.......2.2.2...........1.3.3...........4.4.4...........1.4.4....
.........2.3.4...........3.3.3...........4.4.4...........4.4.4..
...........3.4.4...........3.4.4...........3.4.4...........3.4.4
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...1.1.2...........1.1.2...........1.1.2...........1.1.2........
.....1.2.2...........2.2.2...........1.1.1...........1.1.1......
.......2.2.3...........2.2.3...........1.1.1...........1.1.3....
.........2.3.4...........3.3.4...........1.3.3...........1.3.4..
...........3.4.4...........3.4.4...........3.4.4...........3.4.4
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...1.3.2...........1.1.2...........1.2.2...........1.1.2........
.....3.3.3...........1.1.1...........2.2.2...........1.1.1......
.......3.3.3...........3.3.3...........4.4.4...........1.1.1....
.........3.3.3...........3.3.4...........4.4.4...........4.4.4..
...........3.4.4...........3.4.4...........3.4.4...........3.4.4
CROSSREFS
Sequence in context: A192275 A009807 A220991 * A124126 A086373 A162131
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 17 2009
STATUS
approved