Triangle interpolating between the subsets of an n-set (A000079) and the trees on n labeled nodes (A000272) (read by rows).

A154715

Triangle interpolating between the subsets of an n-set (A000079) and the trees on n labeled nodes (A000272) (read by rows).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =18a(5) =16a(6) =8a(7) =81a(8) =192a(9) =125a(10) =16a(11) =324a(12) =1536a(13) =2500a(14) =1296a(15) =32a(16) =1215a(17) =10240a(18) =31250a(19) =38880a(20) =16807a(21) =64a(22) =4374a(23) =61440a(24) =312500a(25) =699840a(26) =705894a(27) =262144a(28) =128a(29) =15309

External references