70665domain: NAppears in sequencesT(2n,n-1), T given by A026568.at n=8A026575Generalized ordered Bell numbers Bo(7,n).at n=4A238464a(n) counts anti-chains of size four in "0,1,2" Motzkin trees on n edges.at n=5A335355Expansion of 1/sqrt((1-3*x)^3 * (1-7*x)).at n=6A383948