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

A056932

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

Terms

    a(0) =1a(1) =20a(2) =168a(3) =887a(4) =3490a(5) =11196a(6) =30900a(7) =75966a(8) =170379a(9) =354640a(10) =693836a(11) =1288365a(12) =2287844a(13) =3908776a(14) =6456600a(15) =10352796a(16) =16167765a(17) =24660252a(18) =36824128a(19) =53943395a(20) =77656326a(21) =110029700a(22) =153644140a(23) =211691610a(24) =288086175a(25) =387589176a(26) =515950020a(27) =680063833a(28) =888147272

External references