21829632

Appears in sequences

• Number of points of L1 norm 2n in root system version of E_8 lattice.at n=19A010369
• 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 7-subsets of X containing none of X_i, (i=1,...n).at n=15A130813