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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 13 |
| 7 | 31 |
| 8 | 66 |
| 9 | 159 |
| 10 | 365 |
| 11 | 900 |
| 12 | 2162 |
| 13 | 5417 |
| 14 | 13436 |
| 15 | 34165 |
| 16 | 86603 |
| 17 | 223028 |
| 18 | 574493 |
| 19 | 1495524 |
| 20 | 3900055 |
| 21 | 10246172 |
| 22 | 26982966 |
| 23 | 71447432 |
| 24 | 189664782 |
| 25 | 505605729 |
| 26 | 1351179886 |
| 27 | 3623051567 |
| 28 | 9737403960 |
| 29 | 26243202664 |
| 30 | 70878565004 |