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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.

A274389 Main diagonal of rectangular array A274390 of coefficients in the iterations of Euler's tree function (A000169).

Table of values

n a(n)
0 1
1 2
2 30
3 948
4 50680
5 4090980
6 463975764
7 70311813880
8 13718193268896
9 3348658563980040
10 999698412743754460
11 358297471515195652308
12 151813934699349280088328
13 75064081768759279536110316
14 42833194538353991390132088540
15 27937122503026656234469859408880
16 20653210428143999114034181337343616
17 17178393944175652034128269331788145680
18 15970217696130529428248774113884778921452
19 16497536217367322285994072192399435877530380
20 18836957575278690757486149667782477659475272520

List of values

[1, 2, 30, 948, 50680, 4090980, 463975764, 70311813880, 13718193268896, 3348658563980040, 999698412743754460, 358297471515195652308, 151813934699349280088328, 75064081768759279536110316, 42833194538353991390132088540, 27937122503026656234469859408880, 20653210428143999114034181337343616, 17178393944175652034128269331788145680, 15970217696130529428248774113884778921452, 16497536217367322285994072192399435877530380, 18836957575278690757486149667782477659475272520]

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