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, 3, 47, 2544, 6480

Offset

1,2

Links

Table of n, a(n) for n=1..5.

Donghwi Park, Source code for a(1) to a(5).

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

Adjacent sequences: A355253 A355254 A355255 * A355257 A355258 A355259

Keyword

nonn,more

Author

Donghwi Park, Jun 26 2022

Status

approved