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 | 1 |
| 2 | 19 |
| 3 | 20 |
| 4 | 379 |
| 5 | 399 |
| 6 | 7561 |
| 7 | 7960 |
| 8 | 150841 |
| 9 | 158801 |
| 10 | 3009259 |
| 11 | 3168060 |
| 12 | 60034339 |
| 13 | 63202399 |
| 14 | 1197677521 |
| 15 | 1260879920 |
| 16 | 23893516081 |
| 17 | 25154396001 |
| 18 | 476672644099 |
| 19 | 501827040100 |
| 20 | 9509559365899 |
| 21 | 10011386405999 |
| 22 | 189714514673881 |
| 23 | 199725901079880 |
| 24 | 3784780734111721 |