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 | 5 |
| 2 | 11 |
| 3 | 73 |
| 4 | 139 |
| 5 | 269 |
| 6 | 1048613 |
| 7 | 67108913 |
| 8 | 134217779 |
| 9 | 4294967357 |
| 10 | 549755813963 |
| 11 | 9223372036854775931 |
| 12 | 2417851639229258349412511 |
| 13 | 316912650057057350374175801537 |
| 14 | 2596148429267413814265248164610267 |