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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.

A375838 Number of rooted chains starting with the cycle (1)(2)(3)...(n) in the permutation poset of [n].

Table of values

n a(n)
0 1
1 1
2 2
3 9
4 83
5 1270
6 28799
7 906899
8 37866842
9 2024422837
10 134850653405
11 10950546880152
12 1064840930492393
13 122158078221727119
14 16325324374155336370
15 2514183676808883419043
16 442023695390488997377405
17 87989953715757624724243004
18 19688099473681895327628896249
19 4919839221134662388853128069571
20 1365091729320293490230304687026514

List of values

[1, 1, 2, 9, 83, 1270, 28799, 906899, 37866842, 2024422837, 134850653405, 10950546880152, 1064840930492393, 122158078221727119, 16325324374155336370, 2514183676808883419043, 442023695390488997377405, 87989953715757624724243004, 19688099473681895327628896249, 4919839221134662388853128069571, 1365091729320293490230304687026514]

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

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