2598400domain: NAppears in sequencesExpansion of e.g.f. exp((-x^3)/3)/(1-x).at n=10A000090Number T(n,k) of permutations on n elements with exactly k 3-cycles; triangle read by rows.at n=22A186526Like 6-white numbers but with blocks of 6 starting at left.at n=10A277399