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 | 4 |
| 3 | 7 |
| 4 | 148 |
| 5 | 1333 |
| 6 | 4888 |
| 7 | 190633 |
| 8 | 2859496 |
| 9 | 1246447 |
| 10 | 923617228 |
| 11 | 19395961789 |
| 12 | 11438644132 |
| 13 | 1013879820791 |
| 14 | 301122306774928 |
| 15 | 171226409734763 |
| 16 | 270708953790660304 |
| 17 | 525493851475987649 |
| 18 | 104222947209404217052 |
| 19 | 11568747140243868092773 |
| 20 | 451181138469510855618148 |