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 | 47 |
| 2 | 2209 |
| 3 | 103823 |
| 4 | 4879681 |
| 5 | 229345007 |
| 6 | 10779215329 |
| 7 | 506623120463 |
| 8 | 23811286661761 |
| 9 | 1119130473102767 |
| 10 | 52599132235830049 |
| 11 | 2472159215084012303 |
| 12 | 116191483108948578241 |
| 13 | 5460999706120583177327 |