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 | 5 |
| 1 | 29 |
| 2 | 305 |
| 3 | 4289 |
| 4 | 66305 |
| 5 | 1051649 |
| 6 | 16789505 |
| 7 | 268484609 |
| 8 | 4295163905 |
| 9 | 68720263169 |
| 10 | 1099514773505 |
| 11 | 17592198627329 |
| 12 | 281475027042305 |
| 13 | 4503599828697089 |
| 14 | 72057594843234305 |
| 15 | 1152921507828072449 |
| 16 | 18446744086594453505 |
| 17 | 295147905230892433409 |
| 18 | 4722366483075803643905 |