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 | 17 |
| 2 | 145 |
| 3 | 1169 |
| 4 | 9361 |
| 5 | 74897 |
| 6 | 599185 |
| 7 | 4793489 |
| 8 | 38347921 |
| 9 | 306783377 |
| 10 | 2454267025 |
| 11 | 19634136209 |
| 12 | 157073089681 |
| 13 | 1256584717457 |
| 14 | 10052677739665 |
| 15 | 80421421917329 |
| 16 | 643371375338641 |
| 17 | 5146971002709137 |
| 18 | 41175768021673105 |
| 19 | 329406144173384849 |
| 20 | 2635249153387078801 |