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 | 8 |
| 2 | 38 |
| 3 | 184 |
| 4 | 869 |
| 5 | 4144 |
| 6 | 19675 |
| 7 | 93589 |
| 8 | 444824 |
| 9 | 2114934 |
| 10 | 10054148 |
| 11 | 47798953 |
| 12 | 227238276 |
| 13 | 1080310539 |
| 14 | 5135871337 |
| 15 | 24416324712 |
| 16 | 116077006646 |
| 17 | 551838764656 |
| 18 | 2623482504621 |
| 19 | 12472231233800 |
| 20 | 59293915534091 |
| 21 | 281887688707501 |