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 | 125 |
| 2 | 4616 |
| 3 | 17936 |
| 4 | 72772 |
| 5 | 273616 |
| 6 | 1042020 |
| 7 | 3883480 |
| 8 | 14617920 |
| 9 | 55503312 |
| 10 | 210277584 |
| 11 | 791400360 |
| 12 | 2978940280 |
| 13 | 11257286824 |
| 14 | 42533780480 |
| 15 | 160460490488 |
| 16 | 604824610736 |
| 17 | 2282902792488 |
| 18 | 8619222724444 |
| 19 | 32528290390168 |
| 20 | 122688090414988 |