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 | 1 |
| 3 | 256 |
| 4 | 1480 |
| 5 | 117852 |
| 6 | 1513468 |
| 7 | 71154709 |
| 8 | 1283569420 |
| 9 | 47001928863 |
| 10 | 1013346943033 |
| 11 | 32440676063382 |
| 12 | 771708613086275 |
| 13 | 22928865477892898 |
| 14 | 576390471202016758 |
| 15 | 16424125813587374688 |
| 16 | 425923820730159849603 |
| 17 | 11854446538789342310672 |
| 18 | 312866945593394069370317 |