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 | 48 |
| 3 | 642 |
| 4 | 6040 |
| 5 | 44130 |
| 6 | 264936 |
| 7 | 1356194 |
| 8 | 6077196 |
| 9 | 24314490 |
| 10 | 88206140 |
| 11 | 293744154 |
| 12 | 907129236 |
| 13 | 2619716554 |
| 14 | 7125357540 |
| 15 | 18363363690 |
| 16 | 45076309166 |
| 17 | 105864434424 |
| 18 | 238815143406 |
| 19 | 519252051080 |
| 20 | 1091481669390 |
| 21 | 2224042468032 |
| 22 | 4403475647758 |
| 23 | 8489857618992 |
| 24 | 15969368635950 |