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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 10 |
| 5 | 26 |
| 6 | 166 |
| 7 | 652 |
| 8 | 3795 |
| 9 | 18755 |
| 10 | 112124 |
| 11 | 648649 |
| 12 | 4163743 |
| 13 | 27216840 |
| 14 | 190168577 |
| 15 | 1376119903 |
| 16 | 10468226150 |
| 17 | 82744297014 |
| 18 | 681863474058 |
| 19 | 5830425411936 |
| 20 | 51720008131148 |
| 21 | 474821737584174 |
| 22 | 4506628734688128 |
| 23 | 44150936144057758 |
| 24 | 445956917001833090 |
| 25 | 4638564968368158592 |