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 | 3 |
| 2 | 10 |
| 3 | 36 |
| 4 | 136 |
| 5 | 530 |
| 6 | 2109 |
| 7 | 8515 |
| 8 | 34739 |
| 9 | 142817 |
| 10 | 590537 |
| 11 | 2452639 |
| 12 | 10221505 |
| 13 | 42714623 |
| 14 | 178888442 |
| 15 | 750500716 |
| 16 | 3153137436 |
| 17 | 13263180550 |
| 18 | 55844218906 |
| 19 | 235323138044 |
| 20 | 992316962382 |
| 21 | 4186870456952 |
| 22 | 17674378119680 |
| 23 | 74641954142026 |