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) |
|---|---|
| 1 | 12 |
| 2 | 144 |
| 3 | 847 |
| 4 | 4914 |
| 5 | 24711 |
| 6 | 123984 |
| 7 | 602049 |
| 8 | 2925040 |
| 9 | 14100232 |
| 10 | 67998376 |
| 11 | 327293736 |
| 12 | 1575603289 |
| 13 | 7581398753 |
| 14 | 36481691170 |
| 15 | 175528982839 |
| 16 | 844558652717 |
| 17 | 4063476682348 |
| 18 | 19550948024323 |
| 19 | 94066412339581 |
| 20 | 452586859846149 |