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 | 338 |
| 2 | 19266 |
| 3 | 454610 |
| 4 | 6065410 |
| 5 | 53972178 |
| 6 | 354870594 |
| 7 | 1847023698 |
| 8 | 7988589570 |
| 9 | 29746958930 |
| 10 | 97926519106 |
| 11 | 290835675858 |
| 12 | 791675204866 |
| 13 | 2000029880786 |
| 14 | 4736845866818 |
| 15 | 10603978331986 |
| 16 | 22589850308610 |
| 17 | 46054413896530 |
| 18 | 90282306981698 |
| 19 | 170866164067794 |
| 20 | 313276266562818 |
| 21 | 558092423954130 |