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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 6 |
| 7 | 88 |
| 8 | 252 |
| 9 | 282 |
| 10 | 626 |
| 11 | 676 |
| 12 | 1221 |
| 13 | 15751 |
| 14 | 18881 |
| 15 | 10088001 |
| 16 | 10400401 |
| 17 | 27711772 |
| 18 | 30322303 |
| 19 | 47633674 |
| 20 | 65977956 |
| 21 | 808656808 |
| 22 | 831333138 |
| 23 | 831868138 |
| 24 | 836131638 |
| 25 | 836181638 |
| 26 | 2512882152 |
| 27 | 2596886952 |
| 28 | 2893553982 |
| 29 | 6761551676 |