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 | 1 |
| 1 | 7 |
| 2 | 17 |
| 3 | 119 |
| 4 | 257 |
| 5 | 1799 |
| 6 | 4369 |
| 7 | 30583 |
| 8 | 65537 |
| 9 | 458759 |
| 10 | 1114129 |
| 11 | 7798903 |
| 12 | 16843009 |
| 13 | 117901063 |
| 14 | 286331153 |
| 15 | 2004318071 |
| 16 | 4294967297 |
| 17 | 30064771079 |
| 18 | 73014444049 |
| 19 | 511101108343 |
| 20 | 1103806595329 |
| 21 | 7726646167303 |
| 22 | 18764712120593 |
| 23 | 131352984844151 |
| 24 | 281479271743489 |