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 | 6 |
| 3 | 14 |
| 4 | 36 |
| 5 | 108 |
| 6 | 352 |
| 7 | 1182 |
| 8 | 4116 |
| 9 | 14602 |
| 10 | 52488 |
| 11 | 190746 |
| 12 | 699252 |
| 13 | 2581428 |
| 14 | 9587580 |
| 15 | 35792568 |
| 16 | 134219796 |
| 17 | 505294128 |
| 18 | 1908881900 |
| 19 | 7233642930 |
| 20 | 27487816992 |
| 21 | 104715443852 |
| 22 | 399822505524 |
| 23 | 1529755490574 |
| 24 | 5864062367252 |
| 25 | 22517998808028 |