971573domain: NAppears in sequencesComposite terms of A120292: a(n) = A120292(A141779(n)).at n=3A141781Triangular array of numbers of 2-polymatroids of rank k on n unlabeled points, for n>=0, 0<=k<=2n.at n=54A256156Triangular array of numbers of 2-polymatroids of rank k on n unlabeled points, for n>=0, 0<=k<=2n.at n=58A256156