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 | 1023 |
| 3 | 59048 |
| 4 | 1047552 |
| 5 | 9765624 |
| 6 | 60406104 |
| 7 | 282475248 |
| 8 | 1072693248 |
| 9 | 3486725352 |
| 10 | 9990233352 |
| 11 | 25937424600 |
| 12 | 61855850496 |
| 13 | 137858491848 |
| 14 | 288972178704 |
| 15 | 576640565952 |
| 16 | 1098437885952 |
| 17 | 2015993900448 |
| 18 | 3566920035096 |
| 19 | 6131066257800 |