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 | 3 |
| 2 | 10 |
| 3 | 34 |
| 4 | 118 |
| 5 | 418 |
| 6 | 1508 |
| 7 | 5524 |
| 8 | 20486 |
| 9 | 76722 |
| 10 | 289580 |
| 11 | 1099836 |
| 12 | 4198396 |
| 13 | 16093236 |
| 14 | 61902472 |
| 15 | 238805864 |
| 16 | 923574598 |
| 17 | 3579675026 |
| 18 | 13900879132 |
| 19 | 54071886764 |
| 20 | 210645038548 |
| 21 | 821701422716 |
| 22 | 3209243934712 |
| 23 | 12547819633304 |
| 24 | 49109812222108 |
| 25 | 192382627198868 |