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A081263 Number of distinct (modulo rotation and reflection) n X n associative panmagic squares. 1
1, 0, 0, 0, 16, 0, 20190684 (list; graph; refs; listen; history; text; internal format)
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. 213-225, 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

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Last modified November 22 18:55 EST 2019. Contains 329410 sequences. (Running on oeis4.)