Total number of green nodes among tricolored labeled trees on n nodes.

A097173

Total number of green nodes among tricolored labeled trees on n nodes.

Terms

    a(0) =0a(1) =2a(2) =0a(3) =48a(4) =120a(5) =4560a(6) =35700a(7) =1048992a(8) =15514128a(9) =456726240a(10) =10073339100a(11) =323266492560

External references