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 | 2 |
| 4 | 8 |
| 5 | 32 |
| 6 | 158 |
| 7 | 833 |
| 8 | 4755 |
| 9 | 28389 |
| 10 | 176542 |
| 11 | 1131055 |
| 12 | 7432876 |
| 13 | 49873477 |
| 14 | 340658595 |
| 15 | 2362652648 |
| 16 | 16605707901 |
| 17 | 118082160358 |
| 18 | 848399575321 |
| 19 | 6152038125538 |
| 20 | 44981009272740 |
| 21 | 331344933928536 |
| 22 | 2457372361637286 |
| 23 | 18337490246234464 |
| 24 | 137612955519565773 |
| 25 | 1038076541372187991 |