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 | 513 |
| 3 | 20196 |
| 4 | 282340 |
| 5 | 2235465 |
| 6 | 12313161 |
| 7 | 52666768 |
| 8 | 186884496 |
| 9 | 574304985 |
| 10 | 1574304985 |
| 11 | 3932252676 |
| 12 | 9092033028 |
| 13 | 19696532401 |
| 14 | 40357579185 |
| 15 | 78800938560 |
| 16 | 147520415296 |
| 17 | 266108291793 |
| 18 | 464467582161 |
| 19 | 787155279940 |
| 20 | 1299155279940 |
| 21 | 2093435326521 |
| 22 | 3300704544313 |