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 | 7 |
| 2 | 49 |
| 3 | 211 |
| 4 | 889 |
| 5 | 3967 |
| 6 | 17737 |
| 7 | 78799 |
| 8 | 350017 |
| 9 | 1555843 |
| 10 | 6915889 |
| 11 | 30739447 |
| 12 | 136629265 |
| 13 | 607288711 |
| 14 | 2699272273 |
| 15 | 11997693379 |
| 16 | 53327205481 |
| 17 | 237028156975 |
| 18 | 1053540057337 |
| 19 | 4682762813455 |
| 20 | 20813890672513 |
| 21 | 92513343672307 |
| 22 | 411202253906785 |