Number of trees over all forests of labeled rooted trees in which some (possibly all or none) of the trees have been specially designated.

A225573

Number of trees over all forests of labeled rooted trees in which some (possibly all or none) of the trees have been specially designated.

Terms

    a(0) =0a(1) =2a(2) =12a(3) =90a(4) =864a(5) =10290a(6) =147456a(7) =2480058a(8) =48000000a(9) =1052307234a(10) =25798901760a(11) =699896958618

External references