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 | 2 |
| 1 | 2 |
| 2 | 6 |
| 3 | 10 |
| 4 | 32 |
| 5 | 62 |
| 6 | 210 |
| 7 | 436 |
| 8 | 1540 |
| 9 | 3346 |
| 10 | 12192 |
| 11 | 27344 |
| 12 | 102054 |
| 13 | 234388 |
| 14 | 891574 |
| 15 | 2085940 |
| 16 | 8057844 |
| 17 | 19134786 |
| 18 | 74864648 |
| 19 | 179968564 |
| 20 | 711708544 |