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 | 3 |
| 3 | 7 |
| 4 | 49 |
| 5 | 121 |
| 6 | 519841 |
| 7 | 5041 |
| 8 | 120961 |
| 9 | 725761 |
| 10 | 13168196697601 |
| 11 | 39916801 |
| 12 | 458885067042124801 |
| 13 | 6227020801 |
| 14 | 7600054456726354022401 |
| 15 | 1710012252726814772736001 |
| 16 | 83691159552001 |
| 17 | 355687428096001 |
| 18 | 81980778135594585487141085184001 |
| 19 | 121645100408832001 |