Number of (2,2; n,n)-partitions of a chain of length n^2 + n.
A055660
Number of (2,2; n,n)-partitions of a chain of length n^2 + n.
Terms
- a(0) =15a(1) =168a(2) =1260a(3) =7920a(4) =45045a(5) =240240a(6) =1225224a(7) =6046560a(8) =29099070a(9) =137287920a(10) =637408200a(11) =2920488480a(12) =13233463425a(13) =59400885600a(14) =264475371600
External references
- oeis: A055660