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 | 61 |
| 2 | 4091 |
| 3 | 15619 |
| 4 | 46649 |
| 5 | 2985971 |
| 6 | 16777199 |
| 7 | 24137551 |
| 8 | 63999979 |
| 9 | 4750104199 |
| 10 | 8303765579 |
| 11 | 27680640569 |
| 12 | 30840979399 |
| 13 | 34296447191 |
| 14 | 68719476671 |
| 15 | 117648999929 |
| 16 | 351298031531 |
| 17 | 377149515539 |
| 18 | 606355001251 |
| 19 | 689869780961 |