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 | 4 |
| 2 | 17 |
| 3 | 77 |
| 4 | 372 |
| 5 | 1915 |
| 6 | 10481 |
| 7 | 60814 |
| 8 | 372939 |
| 9 | 2409837 |
| 10 | 16360786 |
| 11 | 116393205 |
| 12 | 865549453 |
| 13 | 6713065156 |
| 14 | 54190360453 |
| 15 | 454442481041 |
| 16 | 3952241526188 |
| 17 | 35590085232519 |
| 18 | 331362825860749 |
| 19 | 3185554606447814 |
| 20 | 31581598272055879 |
| 21 | 322516283206446897 |
| 22 | 3389017736055752178 |