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Number of projective meanders.
(Formerly M0374)
0

%I M0374 #30 Jun 28 2017 15:17:37

%S 1,1,2,2,8,12,52,86,400,710,3404,6316,30888,59204,293192,576018,

%T 2877184,5764430,28967428,58970568,297634344,614037754,3109111064

%N Number of projective meanders.

%D S. K. Lando and A. K. Zvonkin, "Plane and projective meanders", Séries Formelles et Combinatoire Algébrique. Laboratoire Bordelais de Recherche Informatique, Université Bordeaux I, 1991, pp. 287-303.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H S. K. Lando and A. K. Zvonkin , <a href="/A005316/a005316_1.pdf">Plane and projective meanders</a>, Séries Formelles et Combinatoire Algébrique. Laboratoire Bordelais de Recherche Informatique, Université Bordeaux I, 1991, pp. 287-303. (Annotated scanned copy)

%H S. K. Lando and A. K. Zvonkin, <a href="http://dx.doi.org/10.1016/0304-3975(93)90316-L">Plane and projective meanders</a>, Theoretical Computer Science Vol. 117 (1993), no. 1-2, 227-241.

%K nonn,nice,more

%O 0,3

%A _N. J. A. Sloane_, _Simon Plouffe_

%E a(16)-a(22) from _Andrew Howroyd_, Mar 30 2017