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 | 10 |
| 4 | 37 |
| 5 | 143 |
| 6 | 562 |
| 7 | 2230 |
| 8 | 8884 |
| 9 | 35465 |
| 10 | 141720 |
| 11 | 566600 |
| 12 | 2265843 |
| 13 | 9062261 |
| 14 | 36246826 |
| 15 | 144982872 |
| 16 | 579922629 |
| 17 | 2319672806 |
| 18 | 9278655812 |
| 19 | 37114552436 |
| 20 | 148458068139 |
| 21 | 593831989359 |
| 22 | 2375327391072 |
| 23 | 9501308431593 |
| 24 | 38005231461009 |
| 25 | 152020921313377 |