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REFERENCES
| F. Bergeron, G. Labelle and P. Leroux, Th\'{e}orie des esp\`{e}ces et Combinatoire des Structures Arborescentes, Publications du LACIM, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1994, p. 214.
F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, pp. 210, 242 (3.2.68, 3.3.92)
G. Labelle, Some new computational methods in the theory of species, pp. 192-209 of "Combinatoire Enumerative (Montreal 1985)", Lect. Notes Math. 1234, 1986.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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