380016

Appears in sequences

• a(n) = n*(n+1)*(n+2)*(n+3)*(3*n+2)/120.at n=26A051836
• A diagonal of A036969.at n=13A060493
• 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 4-subsets of X containing none of X_i, (i=1,...,n).at n=25A130810