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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 33 |
| 5 | 259 |
| 6 | 1762 |
| 7 | 11093 |
| 8 | 66592 |
| 9 | 387264 |
| 10 | 2202053 |
| 11 | 12314587 |
| 12 | 67995221 |
| 13 | 371697914 |
| 14 | 2015659707 |
| 15 | 10859379024 |
| 16 | 58190011080 |
| 17 | 310409500291 |
| 18 | 1649579166385 |
| 19 | 8738000970251 |
| 20 | 46158910515154 |
| 21 | 243260704208613 |
| 22 | 1279386591175904 |
| 23 | 6716811592446952 |
| 24 | 35209193397256085 |