Number of different lattices formed by intersections of two composition series of length n.
A217944
Number of different lattices formed by intersections of two composition series of length n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =73a(6) =397a(7) =2623a(8) =20414a(9) =181607a(10) =1809104a(11) =19886032a(12) =238723606
External references
- oeis: A217944