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A087212
Number of ways in which n X n cells may be numbered using nonzero digits so that n n-digit squares are formed when read across or down the grids.
0
4, 10, 1, 16, 17, 13, 12, 11, 11, 9, 8, 2
OFFSET
2,1
COMMENTS
Sequence conjectured to be complete.
REFERENCES
G. Cesaro, Commentary on Problem 2230 "Squaring the square", pp. 311 Journal of Recreational Mathematics, vol. 29 No.4 1998 Baywood NY.
EXAMPLE
The 4 possibilities for n=2 are:
| 1 6 | 3 6 | 8 1 | 6 4 |
| 6 4 | 6 4 | 1 6 | 4 9 |
CROSSREFS
Sequence in context: A008345 A279082 A016488 * A048870 A337840 A349305
KEYWORD
nonn,base
AUTHOR
Lekraj Beedassy, Oct 30 2003
STATUS
approved