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 | 13 |
| 2 | 42 |
| 3 | 154 |
| 4 | 603 |
| 5 | 2417 |
| 6 | 10783 |
| 7 | 47791 |
| 8 | 215362 |
| 9 | 990403 |
| 10 | 4616134 |
| 11 | 21616069 |
| 12 | 101719485 |
| 13 | 480319135 |
| 14 | 2272163307 |
| 15 | 10763099175 |
| 16 | 51036985495 |
| 17 | 242162709431 |
| 18 | 1149466726275 |
| 19 | 5457682636775 |
| 20 | 25918135231397 |
| 21 | 123098181426713 |
| 22 | 584702778533156 |