466417domain: NAppears in sequencesTriangle T(n, k) read by rows; given by [1, 1, 1, 1, 1, ...] DELTA [1, 1, 2, 5, 14, 42, 132, 429, 1430, ...] (A000108) where DELTA is Deléham's operator defined in A084938.at n=31A085843Number of ways to write n as an ordered sum of 7 nonzero decimal palindromes.at n=29A341204