Number of order-preserving (monotone) functions from the power set of 1 = {0} to the power set of n = {0, ..., n-1}.

A246472

Number of order-preserving (monotone) functions from the power set of 1 = {0} to the power set of n = {0, ..., n-1}.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =30a(4) =109a(5) =418a(6) =1650a(7) =6604a(8) =26589a(9) =107274a(10) =432934a(11) =1746484a(12) =7040626a(13) =28362324a(14) =114175812a(15) =459344920a(16) =1847008989a(17) =7423262554a(18) =29822432862a(19) =119766845860a(20) =480833598054

External references