1,4

Eric Weisstein's World of Mathematics, Associative Magic Square

Walter Trump How many magic squares are there?

Cf. A006052, A081263.

Sequence in context: A159441 A011787 A006070 this_sequence A008704 A037947 A146204

Adjacent sequences: A081259 A081260 A081261 this_sequence A081263 A081264 A081265

nonn,hard,more

Eric Weisstein (eric(AT)weisstein.com), Mar 14, 2003

a(5) from Jud McCranie (j.mccranie(AT)comcast.net), Mar 17 2003

a(6)-a(7) from Max Alekseyev (maxale(AT)gmail.com), May 22 2008