A032176 Functions of n points with no symmetries.

1, 1, 3, 6, 15, 34, 82, 193, 464, 1111, 2683, 6482, 15730, 38232, 93177, 227458, 556323, 1362639, 3342504, 8209130, 20185204, 49684404, 122413446, 301870406, 745019874, 1840103575, 4548008306, 11248190948

Offset

1,3

References

F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Camb. 1998, p. 328. (4.4.31).

Links

Table of n, a(n) for n=1..28.

C. G. Bower, Transforms (2)

N. J. A. Sloane, Transforms

Formula

WEIGH transform of A032175. Also g.f. = (1-B(x^2))/(1-B(x)), B(x)=g.f. of A004111.

Crossrefs

Cf. A001372.

Sequence in context: A006647 A032126 A190525 * A173992 A027600 A024416

Adjacent sequences: A032173 A032174 A032175 * A032177 A032178 A032179

Keyword

nonn

Author

Christian G. Bower

Status

approved