525310domain: NAppears in sequencesLength of the n-th Zimin word (A082215(n)).at n=18A123121a(n) = the n-th positive integer with exactly n zeros and n ones in its binary representation.at n=9A1439601/8 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 31.at n=18A159230