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A038002 Number of connected functions on n points with a single labeled point. 1
0, 1, 3, 9, 27, 81, 242, 722, 2150, 6395, 19003, 56428, 167458, 496724, 1472835, 4365692, 12936998, 38327764, 113529027, 336221554, 995586119, 2947641940, 8726093434, 25829729702, 76450357119, 226257478851 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..25.

FORMULA

G.f.: B(x)(B(x)+1) where B(x) is g.f. of A000107.

CROSSREFS

Cf. A027853.

Sequence in context: A022014 A181140 A291007 * A272338 A249019 A216096

Adjacent sequences:  A037999 A038000 A038001 * A038003 A038004 A038005

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified August 24 04:58 EDT 2017. Contains 291052 sequences.