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 | 70226 |
| 3 | 3880899 |
| 4 | 58106404 |
| 5 | 456335045 |
| 6 | 2421980406 |
| 7 | 9863382151 |
| 8 | 33165873224 |
| 9 | 96450076809 |
| 10 | 250283080090 |
| 11 | 592479412811 |
| 12 | 1300371936876 |
| 13 | 2678768828749 |
| 14 | 5228741809214 |
| 15 | 9743412645135 |
| 16 | 17438019715216 |
| 17 | 30122754096401 |
| 18 | 50428155189474 |
| 19 | 82094249361619 |