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) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 51 |
| 4 | 115 |
| 5 | 511 |
| 6 | 5263 |
| 7 | 116623 |
| 8 | 204091 |
| 9 | 823363 |
| 10 | 1144363 |
| 11 | 78325123 |
| 12 | 883337023 |
| 13 | 6860264683 |
| 14 | 19613836423 |
| 15 | 167589841663 |