For n >= 1, n n's take places at stage n: the first takes the least untaken place (l.u.p) and for 2<=k<=n, the k-th n takes the l.u.p. more than n-1 places past the place of the (k-1)st n.

A026409

For n >= 1, n n's take places at stage n: the first takes the least untaken place (l.u.p) and for 2<=k<=n, the k-th n takes the l.u.p. more than n-1 places past the place of the (k-1)st n.