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 | 6 |
| 2 | 30 |
| 3 | 114 |
| 4 | 486 |
| 5 | 1986 |
| 6 | 8202 |
| 7 | 33858 |
| 8 | 140262 |
| 9 | 580938 |
| 10 | 2407710 |
| 11 | 9980394 |
| 12 | 41384106 |
| 13 | 171634482 |
| 14 | 711932538 |
| 15 | 2953394214 |
| 16 | 12253006566 |
| 17 | 50838740046 |
| 18 | 210946278126 |
| 19 | 875324356398 |
| 20 | 3632308990686 |
| 21 | 15073375131306 |
| 22 | 62553271396074 |