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 | 24 |
| 2 | 324 |
| 3 | 3240 |
| 4 | 26730 |
| 5 | 192456 |
| 6 | 1250964 |
| 7 | 7505784 |
| 8 | 42220035 |
| 9 | 225173520 |
| 10 | 1148384952 |
| 11 | 5637526128 |
| 12 | 26778249108 |
| 13 | 123591918960 |
| 14 | 556163635320 |
| 15 | 2447119995408 |
| 16 | 10553204980197 |
| 17 | 44695926974952 |
| 18 | 186233029062300 |