Number of antichains (or order ideals) in the poset 5*m*n or plane partitions with not more than m rows, n columns and entries <= 5.

A056941

Number of antichains (or order ideals) in the poset 5*m*n or plane partitions with not more than m rows, n columns and entries <= 5.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =1a(6) =1a(7) =21a(8) =21a(9) =1a(10) =1a(11) =56a(12) =196a(13) =56a(14) =1a(15) =1a(16) =126a(17) =1176a(18) =1176a(19) =126a(20) =1a(21) =1a(22) =252a(23) =5292a(24) =14112a(25) =5292a(26) =252a(27) =1a(28) =1a(29) =462

External references