Antichains (or order ideals) in the poset 2*2*3*n or size of the distributive lattice J(2*2*3*n).

A006360

Antichains (or order ideals) in the poset 2*2*3*n or size of the distributive lattice J(2*2*3*n).

Terms

    a(0) =1a(1) =50a(2) =887a(3) =8790a(4) =59542a(5) =307960a(6) =1301610a(7) =4701698a(8) =14975675a(9) =43025762a(10) =113414717a(11) =277904900a(12) =639562508a(13) =1393844960a(14) =2896063220a(15) =5768600412a(16) =11066514565a(17) =20526933442a(18) =36936277875a(19) =64660182026a(20) =110394412610

External references