A151941 2^(2^n)*( (2^(n-1))! )^2*binomial(2*n,n).

8, 384, 2949120, 7457942274048000, 473804945588441678165307763458048000000, 1180144503132859774172436967820251490293315957318932076130423256619673861908070400000000000000

Offset

1,1

Comments

The number of most-perfect magic squares of order 2^m where m>=2.

The next term is too large to include here.

Links

Table of n, a(n) for n=1..6.

Maple

f:=m->2^(2^m)*( (2^(m-1))! )^2*binomial(2*m, m);

Crossrefs

A subsequence of A151932. Cf. A051235.

Sequence in context: A096204 A153836 A376868 * A085806 A042115 A159515

Adjacent sequences: A151938 A151939 A151940 * A151942 A151943 A151944

Keyword

nonn

Author

N. J. A. Sloane, Aug 12 2009, based on email from Reinhardt Wiewe.

Status

approved