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) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 2274 |
| 4 | 44304 |
| 5 | 229974 |
| 6 | 498906 |
| 7 | 4177662 |
| 8 | 20671542 |
| 9 | 22999974 |
| 10 | 41673714 |
| 11 | 73687923 |
| 12 | 403999652 |
| 13 | 479444901 |
| 14 | 4158499614 |
| 15 | 27378395352 |
| 16 | 209659386726 |
| 17 | 216276435966 |
| 18 | 229999999974 |
| 19 | 406406685462 |
| 20 | 922964834547 |