Number of distributive lattices; also number of paths with n turns when light is reflected from 6 glass plates.
A006359
Number of distributive lattices; also number of paths with n turns when light is reflected from 6 glass plates.
Terms
- a(0) =1a(1) =6a(2) =21a(3) =91a(4) =371a(5) =1547a(6) =6405a(7) =26585a(8) =110254a(9) =457379a(10) =1897214a(11) =7869927a(12) =32645269a(13) =135416457a(14) =561722840a(15) =2330091144a(16) =9665485440a(17) =40093544735a(18) =166312629795a(19) =689883899612
External references
- oeis: A006359