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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 17 |
| 5 | 112 |
| 6 | 620 |
| 7 | 2821 |
| 8 | 13805 |
| 9 | 69036 |
| 10 | 327978 |
| 11 | 1540792 |
| 12 | 7274254 |
| 13 | 34083946 |
| 14 | 158284977 |
| 15 | 732296355 |
| 16 | 3377163866 |
| 17 | 15513066609 |
| 18 | 71017218563 |
| 19 | 324217343701 |
| 20 | 1476439351581 |
| 21 | 6707726917103 |
| 22 | 30409720266127 |
| 23 | 137599767926968 |
| 24 | 621531352302268 |
| 25 | 2802892252591572 |
| 26 | 12621236296192889 |