A105074 Number of ways to fill in an n X n grid such that the digits of each row and each column form a square number.

3, 4, 13, 14, 76, 108, 459, 844

Offset: 1

Author

Matthijs Coster, Apr 29 2005

Keywords

• nonn
• base
• more

Comments

Leading zeros are forbidden in the rows and columns.

Examples

			The 1 X 1 crosssquare-puzzle is easy; the only solutions are 1, 4, and 9.
The 4 solutions for n=2 are [16/64], [36/64], [64/49], [81/16].
Or, writing them as 2 X 2 matrices,
  16  36  64  81
  64  64  49  16
		

Extensions

Corrected and extended by Luca Petrone, Jan 08 2017