Matula-Goebel tree number of tree n with a new leaf added below each existing vertex.

Terms

a(0) =2a(1) =6a(2) =26a(3) =18a(4) =202a(5) =78a(6) =122a(7) =54a(8) =338a(9) =606a(10) =2462a(11) =234a(12) =794a(13) =366a(14) =2626a(15) =162a(16) =1346a(17) =1014a(18) =502a(19) =1818a(20) =1586a(21) =7386a(22) =4546a(23) =702a(24) =20402a(25) =2382a(26) =4394a(27) =1098a(28) =8914a(29) =7878