307960

Appears in sequences

• Antichains (or order ideals) in the poset 2*2*3*n or size of the distributive lattice J(2*2*3*n).at n=5A006360
• Antichains (or order ideals) in the poset 2*2*5*n or size of the distributive lattice J(2*2*5*n).at n=3A006362
• Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with every one adjacent to exactly 2 other ones.at n=12A153987