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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 14 |
| 6 | 42 |
| 7 | 79 |
| 8 | 254 |
| 9 | 506 |
| 10 | 1702 |
| 11 | 3548 |
| 12 | 12320 |
| 13 | 26666 |
| 14 | 94794 |
| 15 | 211751 |
| 16 | 766362 |
| 17 | 1758352 |
| 18 | 6453812 |
| 19 | 15150922 |
| 20 | 56238710 |
| 21 | 134659120 |