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 | 3 |
| 3 | 19 |
| 4 | 225 |
| 5 | 4841 |
| 6 | 192355 |
| 7 | 14537643 |
| 8 | 2135997537 |
| 9 | 616565334097 |
| 10 | 351243585487331 |
| 11 | 395958973398105283 |
| 12 | 885030941975862363649 |
| 13 | 3928075680727698371316537 |
| 14 | 34658158001445631936261356547 |
| 15 | 608435501761943981290097259909211 |