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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 23 |
| 3 | 431 |
| 4 | 7750 |
| 5 | 140274 |
| 6 | 2604744 |
| 7 | 50046408 |
| 8 | 998853264 |
| 9 | 20742534576 |
| 10 | 448372820160 |
| 11 | 10086271796160 |
| 12 | 235977273544320 |
| 13 | 5737221760152960 |
| 14 | 144817445022243840 |
| 15 | 3791415072241843200 |
| 16 | 102851265545431603200 |
| 17 | 2888120485072388966400 |