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 | 2 |
| 2 | 9 |
| 3 | 36 |
| 4 | 140 |
| 5 | 542 |
| 6 | 2100 |
| 7 | 8152 |
| 8 | 31707 |
| 9 | 123542 |
| 10 | 482119 |
| 11 | 1884060 |
| 12 | 7371715 |
| 13 | 28874778 |
| 14 | 113213129 |
| 15 | 444285136 |
| 16 | 1744931000 |
| 17 | 6858286418 |
| 18 | 26974115244 |
| 19 | 106157250796 |
| 20 | 418025117820 |
| 21 | 1646975313678 |
| 22 | 6492134765114 |
| 23 | 25602897974056 |
| 24 | 101013355547390 |
| 25 | 398698620627842 |
| 26 | 1574259178022460 |