252648domain: NAppears in sequencesA version of F. K. Hwang's sequence in {3*k, 3*k+1, 3*k+2}.at n=50A123945Number of 3 X 3 semimagic squares with distinct positive values and magic sum n.at n=32A173547Number of length n+7 0..1 arrays with at most two downsteps in every n consecutive neighbor pairs.at n=19A256822