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 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 62 |
| 5 | 339 |
| 6 | 1882 |
| 7 | 10594 |
| 8 | 60216 |
| 9 | 344846 |
| 10 | 1986620 |
| 11 | 11499940 |
| 12 | 66835540 |
| 13 | 389741279 |
| 14 | 2279233530 |
| 15 | 13362109050 |
| 16 | 78505098150 |
| 17 | 462109616730 |
| 18 | 2724728263348 |
| 19 | 16089931091944 |
| 20 | 95141866318652 |