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 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 92 |
| 6 | 423 |
| 7 | 2091 |
| 8 | 10950 |
| 9 | 60120 |
| 10 | 343453 |
| 11 | 2029809 |
| 12 | 12354661 |
| 13 | 77168197 |
| 14 | 493189283 |
| 15 | 3217459119 |
| 16 | 21382723456 |
| 17 | 144518555231 |
| 18 | 991885282987 |
| 19 | 6904454991721 |
| 20 | 48691257834999 |
| 21 | 347542736059492 |
| 22 | 2508603139285095 |
| 23 | 18297609829743478 |
| 24 | 134772911886028731 |