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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 205 |
| 7 | 4009 |
| 8 | 5523 |
| 9 | 14063 |
| 10 | 32669 |
| 11 | 47704 |
| 12 | 196620 |
| 13 | 589791 |
| 14 | 782889 |
| 15 | 804393 |
| 16 | 849445 |
| 17 | 976320 |
| 18 | 1256587 |
| 19 | 1789793 |
| 20 | 9067576 |
| 21 | 17283444 |
| 22 | 18567900 |
| 23 | 24793858 |
| 24 | 59704212 |
| 25 | 60741675 |
| 26 | 130071084 |
| 27 | 216799081 |
| 28 | 1518169585 |
| 29 | 4849913556 |