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 | 5 |
| 3 | 13 |
| 4 | 36 |
| 5 | 104 |
| 6 | 311 |
| 7 | 955 |
| 8 | 2995 |
| 9 | 9553 |
| 10 | 30896 |
| 11 | 101082 |
| 12 | 333946 |
| 13 | 1112496 |
| 14 | 3732955 |
| 15 | 12605029 |
| 16 | 42800317 |
| 17 | 146046819 |
| 18 | 500555447 |
| 19 | 1722402303 |
| 20 | 5948047169 |
| 21 | 20607691517 |
| 22 | 71610355540 |
| 23 | 249520257106 |
| 24 | 871614139396 |
| 25 | 3051737703526 |