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 | 2 |
| 2 | 8 |
| 3 | 28 |
| 4 | 105 |
| 5 | 384 |
| 6 | 1442 |
| 7 | 5388 |
| 8 | 20317 |
| 9 | 76712 |
| 10 | 290790 |
| 11 | 1104538 |
| 12 | 4205909 |
| 13 | 16044994 |
| 14 | 61322356 |
| 15 | 234739140 |
| 16 | 899911685 |
| 17 | 3454630372 |
| 18 | 13278582906 |
| 19 | 51098682962 |
| 20 | 196853475135 |
| 21 | 759139115962 |
| 22 | 2930340545406 |
| 23 | 11321631496180 |
| 24 | 43779660235746 |
| 25 | 169429224658130 |