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 | 7 |
| 2 | 77 |
| 3 | 721 |
| 4 | 6545 |
| 5 | 59017 |
| 6 | 531377 |
| 7 | 4782841 |
| 8 | 43046465 |
| 9 | 387419977 |
| 10 | 3486783377 |
| 11 | 31381057561 |
| 12 | 282429532385 |
| 13 | 2541865820137 |
| 14 | 22876792438577 |
| 15 | 205891132061881 |
| 16 | 1853020188786305 |
| 17 | 16677181699535497 |
| 18 | 150094635296736977 |
| 19 | 1350851717672467801 |
| 20 | 12157665459055880225 |
| 21 | 109418989131510262057 |