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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A319220 Number of rooted identity trees with n colored non-root nodes where the set of colors equals {1,...,k} for some k <= n.

Table of values

n a(n)
0 1
1 1
2 4
3 32
4 362
5 5454
6 102469
7 2312418
8 60994931
9 1842667249
10 62760237328
11 2379922607427
12 99460696044565
13 4542324964768755
14 225087388544097949
15 12029089158757401655
16 689679033455762592599
17 42228989406791157626917
18 2750301966874829159250696

List of values

[1, 1, 4, 32, 362, 5454, 102469, 2312418, 60994931, 1842667249, 62760237328, 2379922607427, 99460696044565, 4542324964768755, 225087388544097949, 12029089158757401655, 689679033455762592599, 42228989406791157626917, 2750301966874829159250696]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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