0,4
Table of n, a(n) for n=0..31.
E. M. Rains and N. J. A. Sloane, On Cayley's Enumeration of Alkanes (or 4-Valent Trees), J. Integer Sequences, Vol. 2 (1999), Article 99.1.1.
Index entries for sequences related to rooted trees
Sequence in context: A140669 A001636 A347786 * A334893 A239872 A099517
Adjacent sequences: A036585 A036586 A036587 * A036589 A036590 A036591
nonn,fini,full
N. J. A. Sloane.
approved