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 | 4 |
| 3 | 9 |
| 4 | 23 |
| 5 | 64 |
| 6 | 186 |
| 7 | 551 |
| 8 | 1645 |
| 9 | 4926 |
| 10 | 14768 |
| 11 | 44293 |
| 12 | 132867 |
| 13 | 398588 |
| 14 | 1195750 |
| 15 | 3587235 |
| 16 | 10761689 |
| 17 | 32285050 |
| 18 | 96855132 |
| 19 | 290565377 |
| 20 | 871696111 |
| 21 | 2615088312 |
| 22 | 7845264914 |
| 23 | 23535794719 |
| 24 | 70607384133 |
| 25 | 211822152374 |
| 26 | 635466457096 |