1736448

Appears in sequences

• If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 6-subsets of X containing none of X_i, (i=1,...n).at n=13A130812
• Triangle read by rows: T(n,k) = number of colored weighted Motzkin paths ending at (n,k).at n=48A293172