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 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 15 |
| 5 | 91 |
| 6 | 246 |
| 7 | 715 |
| 8 | 3535 |
| 9 | 21099 |
| 10 | 95995 |
| 11 | 175470 |
| 12 | 4468006 |
| 13 | 31516774 |
| 14 | 192339970 |
| 15 | 212951314 |
| 16 | 5138843466 |
| 17 | 76699112491 |
| 18 | 103728576730 |
| 19 | 3051100701874 |
| 20 | 14417674958635 |
| 21 | 245230361204214 |
| 22 | 2296196521511806 |
| 23 | 10940476546738414 |