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A355256
a(n) is the number of n-th order n X n magic arrays composed of the numbers from 1 to n^2 in which each 2 X 2 subsquare has the same sum, counted up to rotations and reflections.
1
1, 3, 47, 2544, 6480
OFFSET
1,2
EXAMPLE
For n = 2 the a(2) = 3 solutions are (1 2; 3 4), (1 2; 4 3) and (1 3; 4 2).
CROSSREFS
Sequence in context: A239450 A187665 A088718 * A354556 A219162 A016548
KEYWORD
nonn,more
AUTHOR
Donghwi Park, Jun 26 2022
STATUS
approved