23708domain: NAppears in sequencesa(n) = prime(n)*prime(n-1) + 1.at n=36A023523G.f.: exp( Sum_{n>=1} A007837(n)*x^n/n ), where A007837(n) = number of partitions of n-set with distinct block sizes.at n=12A168268Number of 4-step one space at a time bishop's tours on an n X n board summed over all starting positions.at n=27A187157