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 | 7 |
| 2 | 49 |
| 3 | 218 |
| 4 | 857 |
| 5 | 3609 |
| 6 | 15942 |
| 7 | 69852 |
| 8 | 302053 |
| 9 | 1305379 |
| 10 | 5658937 |
| 11 | 24549216 |
| 12 | 106431608 |
| 13 | 461300682 |
| 14 | 1999592300 |
| 15 | 8668312567 |
| 16 | 37577096221 |
| 17 | 162893110032 |
| 18 | 706125302623 |
| 19 | 3060997024742 |
| 20 | 13269191906269 |
| 21 | 57520894059888 |
| 22 | 249348416142040 |