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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 21 |
| 5 | 78 |
| 6 | 305 |
| 7 | 1304 |
| 8 | 6007 |
| 9 | 29854 |
| 10 | 159012 |
| 11 | 904986 |
| 12 | 5479078 |
| 13 | 35150263 |
| 14 | 238033523 |
| 15 | 1695554145 |
| 16 | 12663533586 |
| 17 | 98881246850 |
| 18 | 805128085616 |
| 19 | 6820302066048 |
| 20 | 59983405937707 |
| 21 | 546690232627480 |
| 22 | 5154757226832625 |
| 23 | 50208266917662433 |
| 24 | 504482106565647708 |