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A280768
Coefficients of g.f. for the class of multiply-rooted C-trees.
0
1, 2, 6, 23, 97, 446, 2140, 10662, 54482
OFFSET
1,2
CROSSREFS
Sequence in context: A150297 A374165 A150298 * A370183 A278301 A242586
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jan 17 2017
STATUS
approved