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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 46 |
| 6 | 211 |
| 7 | 1038 |
| 8 | 5400 |
| 9 | 29425 |
| 10 | 166767 |
| 11 | 977637 |
| 12 | 5901299 |
| 13 | 36538483 |
| 14 | 231286924 |
| 15 | 1492482109 |
| 16 | 9793849702 |
| 17 | 65217085321 |
| 18 | 439887071563 |
| 19 | 3000650380603 |
| 20 | 20673092451143 |
| 21 | 143687057466690 |
| 22 | 1006538694994567 |
| 23 | 7100409431126274 |
| 24 | 50404258628152846 |
| 25 | 359845398688215262 |