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 | 2 |
| 1 | 3 |
| 2 | 6 |
| 3 | 14 |
| 4 | 35 |
| 5 | 116 |
| 6 | 448 |
| 7 | 1980 |
| 8 | 10098 |
| 9 | 57840 |
| 10 | 368201 |
| 11 | 2578384 |
| 12 | 19697486 |
| 13 | 163017000 |
| 14 | 1452918806 |
| 15 | 13874348700 |
| 16 | 141322966623 |
| 17 | 1529472867448 |
| 18 | 17526468199148 |
| 19 | 211996227034964 |
| 20 | 2699219798770446 |
| 21 | 36085910558435148 |
| 22 | 505406091697374877 |