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 | 5 |
| 3 | 21 |
| 4 | 193 |
| 5 | 4861 |
| 6 | 2443 |
| 7 | 78401 |
| 8 | 707209 |
| 9 | 85701889 |
| 10 | 4203312961 |
| 11 | 841345613 |
| 12 | 841819933 |
| 13 | 4211020661 |
| 14 | 4212763061 |
| 15 | 2229320057669 |
| 16 | 376856710434461 |
| 17 | 317005189060740101 |
| 18 | 317069381268836117 |
| 19 | 317122432680485717 |