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) |
|---|---|
| 0 | 8 |
| 1 | 35 |
| 2 | 143 |
| 3 | 575 |
| 4 | 2303 |
| 5 | 9215 |
| 6 | 36863 |
| 7 | 147455 |
| 8 | 589823 |
| 9 | 2359295 |
| 10 | 9437183 |
| 11 | 37748735 |
| 12 | 150994943 |
| 13 | 603979775 |
| 14 | 2415919103 |
| 15 | 9663676415 |
| 16 | 38654705663 |
| 17 | 154618822655 |
| 18 | 618475290623 |
| 19 | 2473901162495 |
| 20 | 9895604649983 |
| 21 | 39582418599935 |
| 22 | 158329674399743 |
| 23 | 633318697598975 |
| 24 | 2533274790395903 |