

A081263


Number of distinct (modulo rotation and reflection) n X n associative panmagic squares.


1




OFFSET

1,5


COMMENTS

It is known that a(10)=0.
Trump estimates a(8) ~= 4.677*10^15 and a(9) ~= 1.363*10^24.


REFERENCES

Gardner, M. "Magic Squares and Cubes." Ch. 17 in Time Travel and Other Mathematical Bewilderments. New York: W.H. Freeman, pp. 213225, 1988.


LINKS

Table of n, a(n) for n=1..7.
Eric Weisstein's World of Mathematics, Associative Magic Square
Walter Trump, How many magic squares are there?


CROSSREFS

Cf. A006052, A081262.
Sequence in context: A111979 A309984 A173436 * A265491 A209201 A050467
Adjacent sequences: A081260 A081261 A081262 * A081264 A081265 A081266


KEYWORD

nonn,hard,more


AUTHOR

Eric W. Weisstein, Mar 14 2003


EXTENSIONS

a(6)a(7) from Trump's website, added by Max Alekseyev, May 22 2008


STATUS

approved



