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 | 5 |
| 3 | 39 |
| 4 | 399 |
| 5 | 4943 |
| 6 | 70846 |
| 7 | 1142543 |
| 8 | 20355695 |
| 9 | 395414964 |
| 10 | 8292073877 |
| 11 | 186265497096 |
| 12 | 4453789285009 |
| 13 | 112771923093955 |
| 14 | 3010597702761965 |
| 15 | 84424863975107571 |
| 16 | 2478907364772699611 |
| 17 | 75998810193380960765 |