4323102domain: NAppears in sequencesNumber of nX4 0..1 arrays with every element equal to 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=18A298096Numbers k such that 6*k - 1 is a prime that can be written as p*q - 2, with p and q being consecutive primes.at n=27A342565