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 | 3 |
| 2 | 21 |
| 3 | 48 |
| 4 | 161 |
| 5 | 473 |
| 6 | 1476 |
| 7 | 4553 |
| 8 | 14241 |
| 9 | 44688 |
| 10 | 141081 |
| 11 | 447153 |
| 12 | 1422596 |
| 13 | 4539473 |
| 14 | 14522361 |
| 15 | 46556048 |
| 16 | 149508801 |
| 17 | 480810153 |
| 18 | 1548053316 |
| 19 | 4988972313 |
| 20 | 16090635281 |
| 21 | 51928966928 |
| 22 | 167675418921 |
| 23 | 541639730273 |
| 24 | 1750245266436 |
| 25 | 5657268819873 |
| 26 | 18289912673001 |