3625216domain: NAppears in sequencesLargest square <= n!.at n=10A065731Largest power (>=2) <= n!.at n=9A074187Duplicate of A065731.at n=10A0872961/4 the number of arrangements of n+1 nonzero numbers x(i) in -2..2 with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.at n=11A189944