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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 11 |
| 5 | 31 |
| 6 | 87 |
| 7 | 246 |
| 8 | 699 |
| 9 | 1996 |
| 10 | 5723 |
| 11 | 16468 |
| 12 | 47533 |
| 13 | 137567 |
| 14 | 399073 |
| 15 | 1160082 |
| 16 | 3378483 |
| 17 | 9855207 |
| 18 | 28790403 |
| 19 | 84218052 |
| 20 | 246651729 |
| 21 | 723165765 |
| 22 | 2122391109 |
| 23 | 6234634266 |
| 24 | 18330019029 |
| 25 | 53932825926 |
| 26 | 158802303429 |
| 27 | 467898288676 |
| 28 | 1379485436579 |
| 29 | 4069450219561 |