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 | 2 |
| 3 | 5 |
| 4 | 25 |
| 5 | 32 |
| 6 | 71 |
| 7 | 2745 |
| 8 | 10623 |
| 9 | 63201 |
| 10 | 85868 |
| 11 | 369119 |
| 12 | 1039161 |
| 13 | 2285297 |
| 14 | 52962021 |
| 15 | 66998865 |
| 16 | 315796805 |
| 17 | 336125877 |
| 18 | 415074643 |
| 19 | 834972771 |
| 20 | 1309750075 |
| 21 | 1617454215 |
| 22 | 2056836133 |
| 23 | 5455816485 |
| 24 | 9030058217 |
| 25 | 10622144467 |
| 26 | 237371071725 |
| 27 | 341296396624 |