82910domain: NAppears in sequencesSum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026703.at n=21A026713Matrix square of triangle A107876; equals matrix product of triangles: A107876^2 = A107862^-1*A107870 = A107867^-1*A107873.at n=37A107880Column 1 of triangle A107880.at n=7A107882