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 | 23 |
| 2 | 535 |
| 3 | 12391 |
| 4 | 286751 |
| 5 | 6635623 |
| 6 | 153552935 |
| 7 | 3553321280 |
| 8 | 82226315585 |
| 9 | 1902773895292 |
| 10 | 44031505860632 |
| 11 | 1018919543279304 |
| 12 | 23578503968558226 |
| 13 | 545622913077172100 |
| 14 | 12626092124920479897 |
| 15 | 292176517015939695007 |