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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 34 |
| 6 | 154 |
| 7 | 874 |
| 8 | 5914 |
| 9 | 46234 |
| 10 | 409114 |
| 11 | 4037914 |
| 12 | 43954714 |
| 13 | 522956314 |
| 14 | 6749977114 |
| 15 | 93928268314 |
| 16 | 1401602636314 |
| 17 | 22324392524314 |
| 18 | 378011820620314 |
| 19 | 6780385526348314 |
| 20 | 128425485935180314 |
| 21 | 2561327494111820314 |
| 22 | 53652269665821260314 |
| 23 | 1177652997443428940314 |