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A339784
Number of homeomorphically irreducible leaf colored trees with n leaves of 4 colors.
3
1, 4, 10, 20, 90, 476, 3034, 21380, 163670, 1322960, 11156014, 97142260, 868031736, 7921646244, 73577937258, 693691932892, 6624644271386, 63974219412076, 623878427017208, 6137012579638796, 60836810198042200, 607270688878149596, 6099719973597772370
OFFSET
0,2
LINKS
PROG
(PARI) U(25, 4) \\ See A339779 for U(n, k).
CROSSREFS
Column k=4 of A339779.
Sequence in context: A038065 A249975 A306158 * A277970 A229884 A371066
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Dec 16 2020
STATUS
approved