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 | 2 |
| 2 | 22 |
| 3 | 30 |
| 4 | 42 |
| 5 | 490 |
| 6 | 1002 |
| 7 | 1958 |
| 8 | 3010 |
| 9 | 3718 |
| 10 | 6842 |
| 11 | 12310 |
| 12 | 37338 |
| 13 | 53174 |
| 14 | 89134 |
| 15 | 105558 |
| 16 | 124754 |
| 17 | 204226 |
| 18 | 614154 |
| 19 | 1741630 |
| 20 | 2012558 |
| 21 | 13848650 |
| 22 | 34262962 |
| 23 | 133230930 |
| 24 | 214481126 |
| 25 | 271248950 |
| 26 | 607163746 |
| 27 | 4835271870 |
| 28 | 30388671978 |
| 29 | 45060624582 |
| 30 | 88751778802 |
| 31 | 107438159466 |