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 | 1 |
| 1 | 8 |
| 2 | 54 |
| 3 | 332 |
| 4 | 1921 |
| 5 | 10644 |
| 6 | 57072 |
| 7 | 298176 |
| 8 | 1525248 |
| 9 | 7665664 |
| 10 | 37953536 |
| 11 | 185499648 |
| 12 | 896466944 |
| 13 | 4289462272 |
| 14 | 20343422976 |
| 15 | 95718211584 |
| 16 | 447146360832 |
| 17 | 2075274510336 |
| 18 | 9574555844608 |
| 19 | 43933220470784 |
| 20 | 200579267690496 |
| 21 | 911512319295488 |
| 22 | 4124474274217984 |
| 23 | 18588068701274112 |