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 | 0 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 44 |
| 6 | 165 |
| 7 | 725 |
| 8 | 3607 |
| 9 | 19624 |
| 10 | 115127 |
| 11 | 716177 |
| 12 | 4675144 |
| 13 | 31743253 |
| 14 | 222710685 |
| 15 | 1606581461 |
| 16 | 11868655658 |
| 17 | 89506275569 |
| 18 | 687275710608 |
| 19 | 5361744667232 |
| 20 | 42423406909091 |
| 21 | 339921273158836 |
| 22 | 2754682455861719 |
| 23 | 22553369622588850 |
| 24 | 186375668479844528 |