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 | 7 |
| 2 | 196 |
| 3 | 686 |
| 4 | 38416 |
| 5 | 134456 |
| 6 | 7529536 |
| 7 | 26353376 |
| 8 | 1475789056 |
| 9 | 5165261696 |
| 10 | 289254654976 |
| 11 | 1012391292416 |
| 12 | 56693912375296 |
| 13 | 198428693313536 |
| 14 | 11112006825558016 |
| 15 | 38892023889453056 |
| 16 | 2177953337809371136 |
| 17 | 7622836682332798976 |
| 18 | 426878854210636742656 |