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 | 29 |
| 2 | 464 |
| 3 | 5365 |
| 4 | 49880 |
| 5 | 394632 |
| 6 | 2750969 |
| 7 | 17296732 |
| 8 | 99742368 |
| 9 | 534126988 |
| 10 | 2681856693 |
| 11 | 12722233068 |
| 12 | 57373155952 |
| 13 | 247218913828 |
| 14 | 1022189562610 |
| 15 | 4070289420139 |
| 16 | 15656921120982 |
| 17 | 58336024110584 |
| 18 | 211023516790156 |
| 19 | 742643172981206 |
| 20 | 2547265600634862 |
| 21 | 8529351700138885 |