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 | 2 |
| 2 | 17 |
| 3 | 56 |
| 4 | 1759 |
| 5 | 1009 |
| 6 | 86831 |
| 7 | 2322304 |
| 8 | 85922 |
| 9 | 1144667 |
| 10 | 16019198113 |
| 11 | 123357293 |
| 12 | 21312406359367 |
| 13 | 17061774340031 |
| 14 | 27741170437991 |
| 15 | 182851619022848 |
| 16 | 167169857863289 |
| 17 | 9857517443932187 |
| 18 | 8844183281912559671 |
| 19 | 197147246106875452361 |
| 20 | 681198614358931646209 |