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 | 3 |
| 2 | 11 |
| 3 | 59 |
| 4 | 443 |
| 5 | 4283 |
| 6 | 50363 |
| 7 | 695483 |
| 8 | 11017403 |
| 9 | 196811963 |
| 10 | 3912703163 |
| 11 | 85662309563 |
| 12 | 2047652863163 |
| 13 | 53059407256763 |
| 14 | 1481388530277563 |
| 15 | 44331262220901563 |
| 16 | 1415527220320869563 |
| 17 | 48036189795719781563 |
| 18 | 1726380042510080613563 |
| 19 | 65503446445655792229563 |
| 20 | 2616586102571484256869563 |