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 | 0 |
| 2 | 1 |
| 3 | 9 |
| 4 | 19 |
| 5 | 47 |
| 6 | 207 |
| 7 | 1289 |
| 8 | 2785 |
| 9 | 4074 |
| 10 | 6859 |
| 11 | 24651 |
| 12 | 31510 |
| 13 | 591831 |
| 14 | 623341 |
| 15 | 4331877 |
| 16 | 4955218 |
| 17 | 14242313 |
| 18 | 19197531 |
| 19 | 33439844 |
| 20 | 152956907 |
| 21 | 186396751 |
| 22 | 7981620449 |
| 23 | 48076119445 |
| 24 | 56057739894 |
| 25 | 272307079021 |
| 26 | 600671897936 |