A339784 Number of homeomorphically irreducible leaf colored trees with n leaves of 4 colors.

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

Author

Andrew Howroyd, Dec 16 2020

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..500

Crossrefs

Column k=4 of A339779.

Programs

PARI

U(25, 4) \\ See A339779 for U(n,k).