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 | 1 |
| 2 | 514 |
| 3 | 19686 |
| 4 | 263172 |
| 5 | 1953130 |
| 6 | 10118604 |
| 7 | 40353614 |
| 8 | 134744072 |
| 9 | 387479547 |
| 10 | 1003908820 |
| 11 | 2357947702 |
| 12 | 5180803992 |
| 13 | 10604499386 |
| 14 | 20741757596 |
| 15 | 38449317180 |
| 16 | 68988964880 |
| 17 | 118587876514 |
| 18 | 199164487158 |
| 19 | 322687697798 |
| 20 | 514009128360 |
| 21 | 794401245204 |
| 22 | 1211985118828 |
| 23 | 1801152661486 |