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 | 5 |
| 2 | 71 |
| 3 | 823 |
| 4 | 10012 |
| 5 | 120465 |
| 6 | 1453535 |
| 7 | 17525619 |
| 8 | 211351945 |
| 9 | 2548684656 |
| 10 | 30734932553 |
| 11 | 370635224561 |
| 12 | 4469527322891 |
| 13 | 53898461609719 |
| 14 | 649966808093412 |
| 15 | 7838012982224913 |
| 16 | 94519361817920403 |
| 17 | 1139818186429110279 |
| 18 | 13745178487929574337 |
| 19 | 165754445655292452448 |