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 | 3 |
| 2 | 23 |
| 3 | 227 |
| 4 | 2529 |
| 5 | 30275 |
| 6 | 380162 |
| 7 | 4939443 |
| 8 | 65844845 |
| 9 | 895451117 |
| 10 | 12374186318 |
| 11 | 173257703723 |
| 12 | 2452607696798 |
| 13 | 35042725663002 |
| 14 | 504697422982484 |
| 15 | 7319313029400467 |
| 16 | 106793147620036005 |
| 17 | 1566546633240722681 |
| 18 | 23089471526179716182 |
| 19 | 341774295456352388245 |