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

Author

Christian G. Bower, Jan 04 1999

Keywords

• nonn
• fini
• full

Links

• Index entries for sequences related to rooted trees

Crossrefs

Cf. A038081-A038093.

Programs

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 *)