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 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 103 |
| 4 | 2073 |
| 5 | 58481 |
| 6 | 2101813 |
| 7 | 91492906 |
| 8 | 4671050401 |
| 9 | 273437232283 |
| 10 | 18046800575211 |
| 11 | 1325445408799007 |
| 12 | 107200425419863009 |
| 13 | 9466283137384124247 |
| 14 | 906151826270369213655 |
| 15 | 93459630239922214535911 |
| 16 | 10331984296666203358431361 |
| 17 | 1218745075041575200343722415 |