75376domain: NAppears in sequencesSum_{k=1..n} (k(k+1))^2/2.at n=13A086755The first subdiagonal of the array of A141425 and its higher order differences.at n=16A141533The number of trisubstitution products with composition C_n H_(2n-1) X_2 Y.at n=33A159940a(n) = n^4/6 - 2*n^3/3 - n^2/6 + 5*n/3 + 1.at n=26A299198