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 | 7 |
| 3 | 186 |
| 4 | 1181 |
| 5 | 7081 |
| 6 | 73352 |
| 7 | 759243 |
| 8 | 6588378 |
| 9 | 57693478 |
| 10 | 533724767 |
| 11 | 4922696680 |
| 12 | 44623406796 |
| 13 | 405152379143 |
| 14 | 3698469278671 |
| 15 | 33742294413274 |
| 16 | 307321953516448 |
| 17 | 2799705826422060 |
| 18 | 25518781471597350 |
| 19 | 232579566114463247 |