1905675domain: NAppears in sequencesNumber of unlabeled and connected graphs on n vertices which are semi-P4-sparse (G is semi-P4-sparse iff G has no induced P5, House, or complement of a fork).at n=13A079469Number of binary arrays of length 2*n+4 with no more than n ones in any length 2n subsequence (=50% duty cycle).at n=8A212406