A038082 Number of n-node rooted identity trees of height at most 3.

1, 1, 1, 2, 2, 2, 2, 2, 1, 1, 1

Offset

1,4

Links

Table of n, a(n) for n=1..11.

Index entries for sequences related to rooted trees

Mathematica

Drop[CoefficientList[Series[x(1+x)(1+x^2)(1+x^3)(1+x^4), {x, 0, 11}], x], 1] (* Geoffrey Critzer, Aug 01 2013 *)

Crossrefs

Cf. A038081-A038093.

Sequence in context: A224898 A027360 A037806 * A107740 A016016 A345112

Adjacent sequences: A038079 A038080 A038081 * A038083 A038084 A038085

Keyword

nonn,fini,full

Author

Christian G. Bower, Jan 04 1999

Status

approved