|
| |
|
|
A006657
|
|
Closed meanders with 2 components and 2n bridges.
(Formerly M2037)
|
|
2
| |
|
|
2, 12, 84, 640, 5236, 45164, 406012, 3772008, 35994184, 351173328, 3490681428
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 2,1
|
|
|
REFERENCES
| S. K. Lando and A. K. Zvonkin "Plane and projective meanders", S\'{e}ries Formelles et Combinatoire Alg\'{e}brique. Laboratoire Bordelais de Recherche Informatique, Universit\'{e} Bordeaux I, 1991, pp. 287-303.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
|
|
|
LINKS
| P. Di Francesco, O. Golinelli and E. Guitter, Meander, folding and arch statistics.
|
|
|
CROSSREFS
| Cf. A005315.
A column of triangle A008828.
Sequence in context: A052864 A136278 A130464 * A105927 A052887 A052867
Adjacent sequences: A006654 A006655 A006656 * A006658 A006659 A006660
|
|
|
KEYWORD
| nonn,nice
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
|
| |
|
|
