a(n) is the number of pairs (x,y) where x is plane partition of n+1 and y is a plane partition of n and x covers y.
A090984
a(n) is the number of pairs (x,y) where x is plane partition of n+1 and y is a plane partition of n and x covers y.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =21a(4) =48a(5) =102a(6) =213a(7) =421a(8) =819a(9) =1542a(10) =2854a(11) =5172a(12) =9240a(13) =16233a(14) =28182a(15) =48288a(16) =81862a(17) =137295a(18) =228153a(19) =375658a(20) =613554a(21) =994155a(22) =1599309a(23) =2554932a(24) =4055406a(25) =6397160a(26) =10032907a(27) =15647277a(28) =24275455a(29) =37471066
External references
- oeis: A090984