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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 43 |
| 4 | 649 |
| 5 | 12320 |
| 6 | 404154 |
| 7 | 16957301 |
| 8 | 805174011 |
| 9 | 38921113842 |
| 10 | 1816451773537 |
| 11 | 79799396735243 |
| 12 | 3267743403989063 |
| 13 | 124448560749072651 |
| 14 | 4413401558241969897 |
| 15 | 146147123072487323183 |
| 16 | 4533679418476771721737 |