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 | 10 |
| 2 | 100 |
| 3 | 270 |
| 4 | 729 |
| 5 | 3915 |
| 6 | 21025 |
| 7 | 75400 |
| 8 | 270400 |
| 9 | 1223560 |
| 10 | 5536609 |
| 11 | 21791133 |
| 12 | 85766121 |
| 13 | 366828210 |
| 14 | 1568952100 |
| 15 | 6380972950 |
| 16 | 25951599025 |
| 17 | 108806945995 |
| 18 | 456193527241 |
| 19 | 1877616346320 |
| 20 | 7727955206400 |
| 21 | 32166490458960 |
| 22 | 133888341846169 |