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 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 33 |
| 5 | 125 |
| 6 | 531 |
| 7 | 2349 |
| 8 | 11205 |
| 9 | 55589 |
| 10 | 291423 |
| 11 | 1583485 |
| 12 | 8985813 |
| 13 | 52661609 |
| 14 | 319898103 |
| 15 | 2000390153 |
| 16 | 12898434825 |
| 17 | 85374842121 |
| 18 | 580479540219 |
| 19 | 4041838056561 |
| 20 | 28824970996809 |
| 21 | 210092964771637 |
| 22 | 1564766851282299 |
| 23 | 11890096357039749 |
| 24 | 92151199272181629 |