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 | 12 |
| 4 | 122 |
| 5 | 1740 |
| 6 | 31922 |
| 7 | 715932 |
| 8 | 18978122 |
| 9 | 580513260 |
| 10 | 20125554242 |
| 11 | 779832497532 |
| 12 | 33398722757402 |
| 13 | 1566656717322060 |
| 14 | 79879485803841362 |
| 15 | 4398701789915269212 |
| 16 | 260166428897541369962 |
| 17 | 16449181879032096013740 |
| 18 | 1107112451498156565581282 |
| 19 | 79030557433744270179981372 |