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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 44 |
| 6 | 124 |
| 7 | 138 |
| 8 | 224 |
| 9 | 620 |
| 10 | 4884 |
| 11 | 17482 |
| 12 | 32130 |
| 13 | 83185 |
| 14 | 253576 |
| 15 | 276933 |
| 16 | 386916 |
| 17 | 888823 |
| 18 | 12359950 |
| 19 | 113944389 |
| 20 | 129750250 |
| 21 | 140503288 |
| 22 | 143011869 |