1277025750domain: NAppears in sequencesDenominator of (4^n*(4^n-1)/2)*B_{2n}/(2n)!, B_{n} Bernoulli number.at n=8A181993Greatest 7th-power-free divisor of n!.at n=15A248775T(n, m), denominators of coefficients in a power/Fourier series expansion of the plane pendulum's exact phase space trajectory.at n=21A273507