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 | 3 |
| 3 | 8 |
| 4 | 32 |
| 5 | 142 |
| 6 | 852 |
| 7 | 5701 |
| 8 | 44607 |
| 9 | 394551 |
| 10 | 3888380 |
| 11 | 42208564 |
| 12 | 501770569 |
| 13 | 6470479293 |
| 14 | 89975104185 |
| 15 | 1342248988188 |
| 16 | 21379528462151 |
| 17 | 362090852585327 |
| 18 | 6497538182823358 |
| 19 | 123138900272956033 |
| 20 | 2457584428800060462 |
| 21 | 51519275083628478495 |
| 22 | 1131790003448653575468 |