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A036652 Number of bicentered 6-valent trees with n nodes. 0
0, 0, 1, 0, 1, 1, 3, 4, 11, 19, 49, 103, 254, 583, 1445, 3506, 8815, 22082, 56286, 143822, 371354, 963250, 2516822, 6607348, 17440933, 46233833, 123090070, 328923702, 882114742, 2373351473, 6405275496, 17336081498, 47047112028 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

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

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.

CROSSREFS

Sequence in context: A060285 A025079 A222770 * A097072 A049977 A000677

Adjacent sequences:  A036649 A036650 A036651 * A036653 A036654 A036655

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 24 04:53 EDT 2013. Contains 225615 sequences.