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 | 0 |
| 1 | 2 |
| 2 | 2 |
| 3 | 11 |
| 4 | 11 |
| 5 | 11 |
| 6 | 254 |
| 7 | 254 |
| 8 | 4628 |
| 9 | 11189 |
| 10 | 30872 |
| 11 | 89921 |
| 12 | 444215 |
| 13 | 444215 |
| 14 | 2038538 |
| 15 | 2038538 |
| 16 | 30736352 |
| 17 | 73783073 |
| 18 | 73783073 |
| 19 | 848624051 |
| 20 | 2010885518 |
| 21 | 8984454320 |
| 22 | 29905160726 |
| 23 | 61286220335 |
| 24 | 61286220335 |
| 25 | 626145293297 |
| 26 | 626145293297 |
| 27 | 3168011121626 |
| 28 | 10793608606613 |
| 29 | 33670401061574 |