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 | 22 |
| 2 | 218 |
| 3 | 1838 |
| 4 | 15540 |
| 5 | 132236 |
| 6 | 1126072 |
| 7 | 9588028 |
| 8 | 81634704 |
| 9 | 695055928 |
| 10 | 5917866680 |
| 11 | 50386093544 |
| 12 | 428998916880 |
| 13 | 3652596505952 |
| 14 | 31099055733376 |
| 15 | 264784589835472 |
| 16 | 2254437550085472 |
| 17 | 19194805371407680 |
| 18 | 163429034985577568 |