25569752274domain: NAppears in sequencesNumber of ternary trees (A001764) with n nodes and maximal diameter.at n=20A064017Triangle T, read by rows, where matrix power T^3 has powers of 3 in the secondary diagonal: [T^3](n+1,n) = 3^(n+1), with all 1's in the main diagonal and zeros elsewhere.at n=30A117252