685880domain: NAppears in sequencesNumber of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 7 king-move adjacent elements, with upper left element zero.at n=33A304225Numbers k such that k and k+1 both have at least three divisors with the same value of the Euler totient function (A000010).at n=24A373529