Number of non-isomorphic sets of subsets of {1..n} that are closed under union and intersection.
A326908
Number of non-isomorphic sets of subsets of {1..n} that are closed under union and intersection.
Terms
- a(0) =2a(1) =4a(2) =9a(3) =23a(4) =70a(5) =256a(6) =1160a(7) =6599a(8) =48017a(9) =452518a(10) =5574706a(11) =90198548a(12) =1919074899a(13) =53620291147
External references
- oeis: A326908