495509domain: NAppears in sequencesNumbers n such that n divides the (left) concatenation of all numbers <= n written in base 8 (most significant digit on right).at n=11A061961a(n) = (1/n!)*A001688(n).at n=25A094793Birooted trees: number of unlabeled trees with n nodes rooted at 2 indistinguishable roots.at n=14A303833