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 | 6 |
| 1 | 17 |
| 2 | 50 |
| 3 | 149 |
| 4 | 446 |
| 5 | 1337 |
| 6 | 4010 |
| 7 | 12029 |
| 8 | 36086 |
| 9 | 108257 |
| 10 | 324770 |
| 11 | 974309 |
| 12 | 2922926 |
| 13 | 8768777 |
| 14 | 26306330 |
| 15 | 78918989 |
| 16 | 236756966 |
| 17 | 710270897 |
| 18 | 2130812690 |
| 19 | 6392438069 |
| 20 | 19177314206 |
| 21 | 57531942617 |
| 22 | 172595827850 |
| 23 | 517787483549 |
| 24 | 1553362450646 |
| 25 | 4660087351937 |