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 | 3 |
| 1 | 7 |
| 2 | 23 |
| 3 | 103 |
| 4 | 599 |
| 5 | 4327 |
| 6 | 37463 |
| 7 | 378343 |
| 8 | 4366679 |
| 9 | 56698087 |
| 10 | 817980503 |
| 11 | 12981060583 |
| 12 | 224732540759 |
| 13 | 4214866787047 |
| 14 | 85130743763543 |
| 15 | 1842265527822823 |
| 16 | 42525237455850839 |
| 17 | 1042966136233087207 |
| 18 | 27084277306054762583 |
| 19 | 742412698554627289063 |
| 20 | 21421502369955073624919 |