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 | 230 |
| 4 | 1011 |
| 5 | 4705 |
| 6 | 22412 |
| 7 | 105936 |
| 8 | 497727 |
| 9 | 2339729 |
| 10 | 11013295 |
| 11 | 51846666 |
| 12 | 244013222 |
| 13 | 1148355280 |
| 14 | 5404522372 |
| 15 | 25435928407 |
| 16 | 119711433603 |
| 17 | 563405871570 |
| 18 | 2651594982047 |
| 19 | 12479394172896 |
| 20 | 58732688555813 |
| 21 | 276417903263710 |