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A105074
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Number of ways to fill in an n X n grid (or "crossword") such that each row and column is a perfect square.
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0
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OFFSET
| 1,1
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COMMENTS
| Leading zeros are forbidden in the rows and columns.
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EXAMPLE
| The 1 X 1 crosssquare-puzzle is easy. Only 1, 4, 9 are the solutions.
The 4 solutions for n=2:
16 36 64 81
64 64 49 16
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CROSSREFS
| Sequence in context: A095790 A109474 A053910 * A087884 A057570 A024853
Adjacent sequences: A105071 A105072 A105073 * A105075 A105076 A105077
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KEYWORD
| nonn,more
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AUTHOR
| Matthijs Coster (matthijs(AT)coster.demon.nl), Apr 29 2005
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