196494753792domain: NAppears in sequencesNumber of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.at n=23A207042a(n) is the least number with n prime factors (counted with multiplicity) that is the concatenation of two primes.at n=31A374669