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 | 606 |
| 2 | 1572 |
| 3 | 4120 |
| 4 | 10834 |
| 5 | 28500 |
| 6 | 74886 |
| 7 | 196346 |
| 8 | 515066 |
| 9 | 1352304 |
| 10 | 3552428 |
| 11 | 9333678 |
| 12 | 24522392 |
| 13 | 64420184 |
| 14 | 169229954 |
| 15 | 444582618 |
| 16 | 1168011448 |
| 17 | 3068677974 |
| 18 | 8062255694 |
| 19 | 21181628238 |
| 20 | 55649517844 |
| 21 | 146205759750 |
| 22 | 384121780036 |
| 23 | 1009193088634 |