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 | 4 |
| 2 | 27 |
| 3 | 96 |
| 4 | 434 |
| 5 | 1970 |
| 6 | 8470 |
| 7 | 37431 |
| 8 | 164807 |
| 9 | 723019 |
| 10 | 3180521 |
| 11 | 13980961 |
| 12 | 61446863 |
| 13 | 270126432 |
| 14 | 1187392203 |
| 15 | 5219407184 |
| 16 | 22943336005 |
| 17 | 100852689192 |
| 18 | 443321760393 |
| 19 | 1948727874003 |
| 20 | 8566095221354 |
| 21 | 37654312064817 |
| 22 | 165518509370616 |