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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.

A351825 Total number of size 2 lists in all sets of lists partitioning [n] (cf. A000262).

Table of values

n a(n)
0 0
1 0
2 2
3 6
4 36
5 260
6 2190
7 21042
8 226856
9 2709576
10 35491770
11 505620830
12 7780224012
13 128555409996
14 2269569526406
15 42625044254730
16 848404205856720
17 17836074466842512
18 394872870912995826
19 9181542826326252726
20 223680717959853460340
21 5697036951307194432660
22 151396442683371572351742

List of values

[0, 0, 2, 6, 36, 260, 2190, 21042, 226856, 2709576, 35491770, 505620830, 7780224012, 128555409996, 2269569526406, 42625044254730, 848404205856720, 17836074466842512, 394872870912995826, 9181542826326252726, 223680717959853460340, 5697036951307194432660, 151396442683371572351742]

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

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