383172domain: NAppears in sequencesNumbers k such that 267*2^k + 1 is prime.at n=45A053350Number of unlabeled matroids on n points.at n=9A055545Number of nX5 0..4 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=7A200987