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 | 68 |
| 3 | 4716 |
| 4 | 359172 |
| 5 | 29189088 |
| 6 | 2481226704 |
| 7 | 217953360768 |
| 8 | 19628937626304 |
| 9 | 1802766369904128 |
| 10 | 168204846247664640 |
| 11 | 15899323155731638272 |
| 12 | 1519290122351403276288 |
| 13 | 146525430785641038692352 |