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 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 113 |
| 5 | 986 |
| 6 | 10237 |
| 7 | 123096 |
| 8 | 1680737 |
| 9 | 25668766 |
| 10 | 433329461 |
| 11 | 8009178596 |
| 12 | 160802065393 |
| 13 | 3483842906610 |
| 14 | 80992799730221 |
| 15 | 2010720004254856 |
| 16 | 53081510001375041 |
| 17 | 1484613248976841958 |
| 18 | 43846812123456425221 |
| 19 | 1363477059263944382604 |