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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 30 |
| 7 | 131 |
| 8 | 795 |
| 9 | 5152 |
| 10 | 36800 |
| 11 | 272093 |
| 12 | 2077909 |
| 13 | 16176607 |
| 14 | 127996683 |
| 15 | 1025727646 |
| 16 | 8310377720 |
| 17 | 67967600763 |
| 18 | 560527576100 |
| 19 | 4656993996246 |
| 20 | 38949328897318 |
| 21 | 327718211568300 |
| 22 | 2772480181758683 |
| 23 | 23571996461405321 |
| 24 | 201327668784954950 |
| 25 | 1726755218246463325 |