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 | 8 |
| 3 | 21 |
| 4 | 55 |
| 5 | 143 |
| 6 | 366 |
| 7 | 919 |
| 8 | 2265 |
| 9 | 5491 |
| 10 | 13125 |
| 11 | 31000 |
| 12 | 72485 |
| 13 | 168042 |
| 14 | 386709 |
| 15 | 884161 |
| 16 | 2009742 |
| 17 | 4543830 |
| 18 | 10222264 |
| 19 | 22891099 |
| 20 | 51041560 |
| 21 | 113359224 |
| 22 | 250839510 |
| 23 | 553173006 |
| 24 | 1216070081 |
| 25 | 2665518207 |
| 26 | 5826533103 |
| 27 | 12703217438 |
| 28 | 27628250142 |