1700160

Appears in sequences

• Coordination sequence for diamond structure D^+_6. (Edges defined by l_1 norm = 1.)at n=23A035879
• Numbers that can be expressed as the difference of the squares of primes in exactly fourteen distinct ways.at n=21A092010
• 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 5-subsets of X containing none of X_i, (i=1,...n).at n=20A130811
• Irregular triangle M_2(n,k) read by rows: number of maximum k-matchings in rooted plane trees of size n, 1<=k<=n/2, 2<=n.at n=40A219731