Number of rooted identity trees with 2-colored leaves.

Terms

a(0) =2a(1) =2a(2) =3a(3) =7a(4) =16a(5) =41a(6) =110a(7) =304a(8) =858a(9) =2474a(10) =7234a(11) =21418a(12) =64057a(13) =193277a(14) =587531a(15) =1797817a(16) =5532916a(17) =17115442a(18) =53186682a(19) =165958893a(20) =519764706a(21) =1633331926a(22) =5148420607a(23) =16273962742a(24) =51574291758a(25) =163834983761a(26) =521597902077