Number of chains in the poset of all odd-sized subsets of {1,2,...,n} ordered by inclusion.
A260504
Number of chains in the poset of all odd-sized subsets of {1,2,...,n} ordered by inclusion.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =7a(4) =20a(5) =91a(6) =362a(7) =2227a(8) =11720a(9) =92491a(10) =608222a(11) =5866147a(12) =46290620a(13) =527635291a(14) =4857587282a(15) =63886537267a(16) =672183848720
External references
- oeis: A260504