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 | 63 |
| 2 | 513 |
| 3 | 2107 |
| 4 | 12625 |
| 5 | 26533 |
| 6 | 39609 |
| 7 | 355023 |
| 8 | 3190833 |
| 9 | 4457713 |
| 10 | 19854847 |
| 11 | 38463283 |
| 12 | 242138449 |
| 13 | 370634743 |
| 14 | 516465451 |
| 15 | 574336561 |
| 16 | 701607583 |
| 17 | 1380336193 |
| 18 | 2324581983 |
| 19 | 4882890625 |
| 20 | 6174434113 |
| 21 | 12859758577 |
| 22 | 14793096853 |
| 23 | 20578440583 |
| 24 | 43522669657 |
| 25 | 85504120021 |