Number of planted identity trees where non-root, non-leaf nodes an even distance from root are of degree 2.

A007560

Number of planted identity trees where non-root, non-leaf nodes an even distance from root are of degree 2.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =6a(8) =10a(9) =17a(10) =29a(11) =51a(12) =89a(13) =159a(14) =284a(15) =512a(16) =930a(17) =1692a(18) =3101a(19) =5698a(20) =10515a(21) =19464a(22) =36143a(23) =67296a(24) =125622a(25) =235050a(26) =440756a(27) =828142a(28) =1558955a(29) =2939761

External references