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 | 3 |
| 2 | 5 |
| 3 | 12 |
| 4 | 35 |
| 5 | 106 |
| 6 | 332 |
| 7 | 1062 |
| 8 | 3466 |
| 9 | 11496 |
| 10 | 38621 |
| 11 | 131042 |
| 12 | 448146 |
| 13 | 1542548 |
| 14 | 5338641 |
| 15 | 18563680 |
| 16 | 64814950 |
| 17 | 227117365 |
| 18 | 798387748 |
| 19 | 2814618634 |