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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.

A309725 Number of set partitions of {1,2,...,3n} with sizes in {[n, n, n], [2n, n], [3n]}.

Table of values

n a(n)
0 3
1 5
2 31
3 365
4 6271
5 129130
6 2877421
7 66628441
8 1578320767
9 37983592076
10 925196176906
11 22754692780561
12 564123212097901
13 14079691134569845
14 353428830512017081
15 8915830309096530865
16 225890912989184760703
17 5744976464242932324976
18 146603288011226858621356

List of values

[3, 5, 31, 365, 6271, 129130, 2877421, 66628441, 1578320767, 37983592076, 925196176906, 22754692780561, 564123212097901, 14079691134569845, 353428830512017081, 8915830309096530865, 225890912989184760703, 5744976464242932324976, 146603288011226858621356]

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

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