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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 24 |
| 3 | 198 |
| 4 | 1272 |
| 5 | 7746 |
| 6 | 46620 |
| 7 | 279894 |
| 8 | 1679568 |
| 9 | 10077642 |
| 10 | 60466116 |
| 11 | 362796990 |
| 12 | 2176782264 |
| 13 | 13060693938 |
| 14 | 78364164012 |
| 15 | 470184984486 |
| 16 | 2821109907360 |
| 17 | 16926659444634 |
| 18 | 101559956668308 |
| 19 | 609359740010382 |
| 20 | 3656158440062856 |
| 21 | 21936950640377730 |
| 22 | 131621703842267004 |
| 23 | 789730223053602678 |