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 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 36 |
| 5 | 82 |
| 6 | 196 |
| 7 | 436 |
| 8 | 1000 |
| 9 | 2186 |
| 10 | 4884 |
| 11 | 10540 |
| 12 | 23128 |
| 13 | 49428 |
| 14 | 107048 |
| 15 | 227048 |
| 16 | 486864 |
| 17 | 1026394 |
| 18 | 2183860 |
| 19 | 4581244 |
| 20 | 9686776 |
| 21 | 20237372 |
| 22 | 42571896 |
| 23 | 88632664 |
| 24 | 185653936 |
| 25 | 385380932 |
| 26 | 804316296 |
| 27 | 1665340856 |
| 28 | 3464899440 |
| 29 | 7158117736 |
| 30 | 14853106384 |