| DATA
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1, 2, 4, 10, 32, 122, 544, 2287, 7688, 25662, 79456, 256482, 809784, 2690604, 8874432, 30009480, 98599568, 332395712, 1084222064, 3637730112, 11844968640, 39726351272, 129526799072, 434837072968, 1418856843552, 4764806022144
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| EXAMPLE
|
Some solutions for n=7
..6....3....2....3....1....5....6....5....4....1....5....6....2....2....2....4
..1....6....0....1....4....0....3....1....0....6....4....2....4....4....4....0
..2....1....5....5....0....4....5....4....6....4....6....4....0....0....1....3
..0....5....1....4....6....1....0....2....2....5....2....0....3....5....5....1
..5....2....4....6....3....3....2....3....3....2....3....5....1....1....0....6
..3....4....3....0....5....2....1....0....1....3....0....1....6....6....6....2
..4....0....6....2....2....6....4....6....5....0....1....3....5....3....3....5
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