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A034800 Triangle of number of node labeled trees by number of nodes and number of labels. 1
1, 1, 1, 1, 2, 3, 2, 4, 9, 16, 3, 9, 26, 67, 125, 6, 20, 75, 251, 680, 1296, 11, 48, 214, 888, 3135, 8716, 16807 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

REFERENCES

J. Riordan, An Introduction to Combinatorial Analysis, p. 138.

LINKS

Table of n, a(n) for n=0..27.

Index entries for sequences related to trees

FORMULA

Reference gives generating function.

CROSSREFS

Cf. A034799.

Sequence in context: A274858 A207997 A304489 * A082771 A127157 A236406

Adjacent sequences:  A034797 A034798 A034799 * A034801 A034802 A034803

KEYWORD

nonn,tabl,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 24 06:53 EDT 2019. Contains 323529 sequences. (Running on oeis4.)