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 | 2 |
| 1 | 21 |
| 2 | 208 |
| 3 | 2059 |
| 4 | 20382 |
| 5 | 201761 |
| 6 | 1997228 |
| 7 | 19770519 |
| 8 | 195707962 |
| 9 | 1937309101 |
| 10 | 19177383048 |
| 11 | 189836521379 |
| 12 | 1879187830742 |
| 13 | 18602041786041 |
| 14 | 184141230029668 |
| 15 | 1822810258510639 |
| 16 | 18043961355076722 |
| 17 | 178616803292256581 |
| 18 | 1768124071567489088 |
| 19 | 17502623912382634299 |