425790domain: NAppears in sequencesSum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly three ways.at n=18A076456Number of n X 2 0..5 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=33A201136