%I A105074
%S A105074 3,4,13,14,76,40,459
%N A105074 Number of ways to fill in an n X n grid (or "crossword") such that each 
               row and column is a perfect square.
%C A105074 Leading zeros are forbidden in the rows and columns.
%e A105074 The 1 X 1 crosssquare-puzzle is easy. Only 1, 4, 9 are the solutions.
%e A105074 The 4 solutions for n=2:
%e A105074 16 36 64 81
%e A105074 64 64 49 16
%Y A105074 Sequence in context: A095790 A109474 A053910 this_sequence A087884 A057570 
               A024853
%Y A105074 Adjacent sequences: A105071 A105072 A105073 this_sequence A105075 A105076 
               A105077
%K A105074 nonn,more
%O A105074 1,1
%A A105074 Matthijs Coster (matthijs(AT)coster.demon.nl), Apr 29 2005