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 | 10 |
| 1 | 43 |
| 2 | 175 |
| 3 | 703 |
| 4 | 2815 |
| 5 | 11263 |
| 6 | 45055 |
| 7 | 180223 |
| 8 | 720895 |
| 9 | 2883583 |
| 10 | 11534335 |
| 11 | 46137343 |
| 12 | 184549375 |
| 13 | 738197503 |
| 14 | 2952790015 |
| 15 | 11811160063 |
| 16 | 47244640255 |
| 17 | 188978561023 |
| 18 | 755914244095 |
| 19 | 3023656976383 |
| 20 | 12094627905535 |
| 21 | 48378511622143 |
| 22 | 193514046488575 |
| 23 | 774056185954303 |
| 24 | 3096224743817215 |