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 | 4 |
| 3 | 37 |
| 4 | 100 |
| 5 | 293 |
| 6 | 1320 |
| 7 | 6215 |
| 8 | 24879 |
| 9 | 99567 |
| 10 | 422308 |
| 11 | 1804127 |
| 12 | 7556513 |
| 13 | 31570236 |
| 14 | 132859288 |
| 15 | 559967531 |
| 16 | 2354250563 |
| 17 | 9891690637 |
| 18 | 41598759825 |
| 19 | 174990998789 |
| 20 | 735895232858 |
| 21 | 3094315102349 |
| 22 | 13012504569964 |
| 23 | 54724162019621 |