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 | 3 |
| 3 | 8 |
| 4 | 38 |
| 5 | 86 |
| 6 | 318 |
| 7 | 504 |
| 8 | 3600 |
| 9 | 8132 |
| 10 | 83160 |
| 11 | 116850 |
| 12 | 202272 |
| 13 | 399126 |
| 14 | 6190086 |
| 15 | 8756916 |
| 16 | 25253676 |
| 17 | 309709400 |
| 18 | 1112878446 |
| 19 | 1478724036 |
| 20 | 11062089360 |
| 21 | 97331025386 |