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 | 1 |
| 2 | 8 |
| 3 | 64 |
| 4 | 652 |
| 5 | 7120 |
| 6 | 82440 |
| 7 | 991152 |
| 8 | 12262470 |
| 9 | 155072356 |
| 10 | 1995610260 |
| 11 | 26048900628 |
| 12 | 344054761656 |
| 13 | 4589736845308 |
| 14 | 61750810543324 |
| 15 | 836935922008844 |
| 16 | 11416462124627925 |
| 17 | 156613134014878257 |
| 18 | 2159264087976308543 |