|
| |
|
|
A000677
|
|
Number of bicentered trees with n nodes.
(Formerly M2366 N0936)
|
|
6
| |
|
|
0, 0, 1, 0, 1, 1, 3, 4, 11, 20, 51, 108, 267, 619, 1541, 3762, 9497, 23907, 61216, 157211, 407919, 1063398, 2792026, 7365532, 19535887, 52037837, 139213244, 373820978, 1007420841, 2723783122, 7387129661, 20091790330, 54793762295
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,7
|
|
|
COMMENTS
| See A000676 for more information.
|
|
|
REFERENCES
| N. L. Biggs et al., Graph Theory 1736-1936, Oxford, 1976, p. 49.
A. Cayley, On the analytical forms called trees, with application to the theory of chemical combinations, Reports British Assoc. Advance. Sci. 45 (1875), 257-305 = Math. Papers, Vol. 9, 427-460 (see p. 438).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
|
|
|
LINKS
| N. J. A. Sloane, Table of n, a(n) for n = 0..200
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.
N. J. A. Sloane, Maple program
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to trees
|
|
|
MAPLE
| See link for Maple program.
|
|
|
CROSSREFS
| A000676+A000677 = A000055.
Sequence in context: A036652 A097072 A049977 * A110865 A152982 A001642
Adjacent sequences: A000674 A000675 A000676 * A000678 A000679 A000680
|
|
|
KEYWORD
| nonn,easy,nice
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
| |
|
|
