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A339783
Number of homeomorphically irreducible leaf colored trees with n leaves of 3 colors.
4
1, 3, 6, 10, 36, 144, 706, 3774, 22140, 137096, 888522, 5950434, 40936518, 287748366, 2059386024, 14964163584, 110160504906, 820172543046, 6167144620494, 46780206203250, 357620668556700, 2753050958956812, 21327412744225182, 166164346278018822, 1301341878493196986
OFFSET
0,2
LINKS
PROG
(PARI) U(25, 3) \\ See A339779 for U(n, k).
CROSSREFS
Column k=3 of A339779.
Sequence in context: A068821 A062100 A262242 * A317361 A048089 A081975
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Dec 16 2020
STATUS
approved