6823410

Appears in sequences

• Number of one-sided triangulations of the disk; or flexagons of order n; or unlabeled plane trivalent trees (n-2 internal vertices, all of degree 3 and hence n leaves).at n=17A001683
• Triangle read by rows: for 1 <= k < n, a(n, k) is the least number not already used. For n > 1, a(n, n) is the least number not already used such that the product of the n-th row is a multiple of the product of the previous row.at n=44A094275
• Leading diagonal of triangle A094275.at n=8A094276