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A036651 Number of centered 6-valent trees with n nodes. 0
0, 1, 0, 1, 1, 2, 3, 7, 11, 26, 52, 120, 266, 640, 1509, 3702, 9090, 22781, 57452, 146783, 377357, 978342, 2550611, 6690242, 17633855, 46705333, 124227015, 331757697, 889207207, 2391478247, 6451880415, 17457214729, 47363110968 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..32.

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 trees

CROSSREFS

Sequence in context: A005246 A116406 A112843 * A049454 A095055 A107857

Adjacent sequences:  A036648 A036649 A036650 * A036652 A036653 A036654

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified April 29 19:06 EDT 2017. Contains 285613 sequences.