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 | 9 |
| 2 | 27 |
| 3 | 82 |
| 4 | 207 |
| 5 | 486 |
| 6 | 1055 |
| 7 | 2205 |
| 8 | 4374 |
| 9 | 8427 |
| 10 | 15696 |
| 11 | 28539 |
| 12 | 50630 |
| 13 | 88119 |
| 14 | 150417 |
| 15 | 252727 |
| 16 | 418068 |
| 17 | 682344 |
| 18 | 1099343 |
| 19 | 1750968 |
| 20 | 2758185 |
| 21 | 4301682 |
| 22 | 6645150 |
| 23 | 10175625 |
| 24 | 15451744 |
| 25 | 23281686 |
| 26 | 34819227 |
| 27 | 51712860 |
| 28 | 76292784 |
| 29 | 111850740 |
| 30 | 162997314 |