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 | 0 |
| 4 | 1 |
| 5 | 10 |
| 6 | 71 |
| 7 | 448 |
| 8 | 2710 |
| 9 | 16285 |
| 10 | 99179 |
| 11 | 619784 |
| 12 | 4005585 |
| 13 | 26901537 |
| 14 | 188224882 |
| 15 | 1373263700 |
| 16 | 10444784477 |
| 17 | 82735225014 |
| 18 | 681599167459 |
| 19 | 5830974941867 |
| 20 | 51717594114952 |
| 21 | 474845349889731 |
| 22 | 4506624255883683 |
| 23 | 44151662795470696 |
| 24 | 445957579390657965 |