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) |
|---|---|
| 1 | 5 |
| 2 | 18 |
| 3 | 59 |
| 4 | 184 |
| 5 | 561 |
| 6 | 1694 |
| 7 | 5095 |
| 8 | 15300 |
| 9 | 45917 |
| 10 | 137770 |
| 11 | 413331 |
| 12 | 1240016 |
| 13 | 3720073 |
| 14 | 11160246 |
| 15 | 33480767 |
| 16 | 100442332 |
| 17 | 301327029 |
| 18 | 903981122 |
| 19 | 2711943403 |
| 20 | 8135830248 |
| 21 | 24407490785 |
| 22 | 73222472398 |
| 23 | 219667417239 |
| 24 | 659002251764 |
| 25 | 1977006755341 |