103820domain: NAppears in sequencesa(n) = 2025*n^2 - 3401*n + 1428.at n=7A156854Triangle: Newton expansion of C(n,m)^4, read by rows.at n=24A262705Irregular table: T(n,k) equals the number of alignments of length k of n strings each of length 3.at n=15A299041