630985830

Appears in sequences

• Number of multiset permutations of {1, 1, 2, 2, ..., n, n} with no fixed pair (j,j).at n=7A374980
• T(n,k) is the number of permutations of the multiset {1, 1, 2, 2, ..., n, n} with k occurrences of fixed pairs (j,j), where T(n,k), n >= 2, 0 <= k <= n-2 is a triangle read by rows.at n=15A375220
• Number A(n,k) of multiset permutations of {{1}^k, {2}^k, ..., {n}^k} with no fixed k-tuple {j}^k; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=52A375694