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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 22 |
| 5 | 60 |
| 6 | 173 |
| 7 | 471 |
| 8 | 1303 |
| 9 | 3510 |
| 10 | 9234 |
| 11 | 23574 |
| 12 | 58464 |
| 13 | 140340 |
| 14 | 326792 |
| 15 | 738090 |
| 16 | 1619321 |
| 17 | 3455129 |
| 18 | 7180856 |
| 19 | 14555856 |
| 20 | 28819926 |
| 21 | 55808840 |
| 22 | 105834657 |
| 23 | 196779279 |
| 24 | 359124362 |
| 25 | 643976482 |
| 26 | 1135731758 |
| 27 | 1971734302 |
| 28 | 3372477533 |