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 | 255 |
| 2 | 7425 |
| 3 | 73983 |
| 4 | 419841 |
| 5 | 1690623 |
| 6 | 5407233 |
| 7 | 14661375 |
| 8 | 35111681 |
| 9 | 76335103 |
| 10 | 153588225 |
| 11 | 290033151 |
| 12 | 519482625 |
| 13 | 889719039 |
| 14 | 1466441985 |
| 15 | 2337899007 |
| 16 | 3620254209 |
| 17 | 5463749375 |
| 18 | 8059712257 |
| 19 | 11648466687 |
| 20 | 16528199169 |
| 21 | 23064836607 |