227596domain: NAppears in sequences(Terms in A014450)/2.at n=17A051474(Terms in A014450)/2.at n=20A051474(Terms in A014472)/2.at n=7A051475Symmetrical triangle T(n, m) = floor(Eulerian(n+1, m)/2), read by rows.at n=30A174098Symmetrical triangle T(n, m) = floor(Eulerian(n+1, m)/2), read by rows.at n=33A174098