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A036649 Number of bicentered 5-valent trees with n nodes. 0
0, 0, 1, 0, 1, 1, 3, 4, 10, 18, 46, 95, 231, 524, 1287, 3095, 7713, 19125, 48258, 122026, 311935, 801061, 2072629, 5387753, 14081981, 36959506, 97419796, 257724555, 684254908, 1822560590, 4869517848, 13047469920, 35053803135 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

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

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: A006490 A171160 A139797 * A109887 A200981 A103038

Adjacent sequences:  A036646 A036647 A036648 * A036650 A036651 A036652

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 18 07:10 EDT 2013. Contains 225419 sequences.