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 | 6 |
| 3 | 33 |
| 4 | 176 |
| 5 | 930 |
| 6 | 4884 |
| 7 | 25564 |
| 8 | 133512 |
| 9 | 696231 |
| 10 | 3626710 |
| 11 | 18876363 |
| 12 | 98186556 |
| 13 | 510472118 |
| 14 | 2652899130 |
| 15 | 13782560610 |
| 16 | 71585293504 |
| 17 | 371724613716 |
| 18 | 1929911381586 |
| 19 | 10018066789546 |
| 20 | 51996091023360 |
| 21 | 269839578888159 |
| 22 | 1400217128810676 |