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 | 8 |
| 2 | 160 |
| 3 | 2009 |
| 4 | 25872 |
| 5 | 328208 |
| 6 | 4165357 |
| 7 | 52837520 |
| 8 | 670238112 |
| 9 | 8501756249 |
| 10 | 107841947320 |
| 11 | 1367938389320 |
| 12 | 17351831692125 |
| 13 | 220102059219128 |
| 14 | 2791919445762040 |
| 15 | 35414544563765129 |
| 16 | 449221401563485632 |
| 17 | 5698220042111151488 |
| 18 | 72279974941308391117 |
| 19 | 916846794068851162400 |
| 20 | 11629888423130623254672 |