cp's OEIS Frontend

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.

A369921 Number of cover relations summed over the rank-1 labeled posets on [n].

Table of values

n a(n)
0 0
1 0
2 2
3 18
4 204
5 2940
6 56670
7 1471806
8 52067512
9 2520298584
10 167850357210
11 15435027907530
12 1967345286257604
13 348527628228821652
14 86057693880611800438
15 29677160119074814383030
16 14321851348104417100842480

List of values

[0, 0, 2, 18, 204, 2940, 56670, 1471806, 52067512, 2520298584, 167850357210, 15435027907530, 1967345286257604, 348527628228821652, 86057693880611800438, 29677160119074814383030, 14321851348104417100842480]

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

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