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 | 0 |
| 1 | 1 |
| 2 | 19 |
| 3 | 271 |
| 4 | 3439 |
| 5 | 40951 |
| 6 | 468559 |
| 7 | 5217031 |
| 8 | 56953279 |
| 9 | 612579511 |
| 10 | 6513215599 |
| 11 | 68618940391 |
| 12 | 717570463519 |
| 13 | 7458134171671 |
| 14 | 77123207545039 |
| 15 | 794108867905351 |
| 16 | 8146979811148159 |
| 17 | 83322818300333431 |
| 18 | 849905364703000879 |
| 19 | 8649148282327007911 |
| 20 | 87842334540943071199 |
| 21 | 890581010868487640791 |