0,4
Table of n, a(n) for n=0..15.
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: A067183 A269670 A333480 * A075145 A086142 A258334
Adjacent sequences: A036584 A036585 A036586 * A036588 A036589 A036590
nonn,fini,full
N. J. A. Sloane.
approved