210974400

Appears in sequences

• Greatest common divisor of (x^m+y^m+(x+y)^m) - (z^m+t^m+(z+t)^m) over all x,y,z,t such that x^2 + xy + y^2 = z^2 + zt + t^2 and m=2n.at n=10A238595
• a(n) = (2n)!/(n!*a(n-2)), with a(0) = 1, a(1) = 1.at n=12A372988