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 | 17 |
| 2 | 163 |
| 3 | 1511 |
| 4 | 14095 |
| 5 | 132767 |
| 6 | 1262143 |
| 7 | 12097151 |
| 8 | 116777215 |
| 9 | 1134217727 |
| 10 | 11073741823 |
| 11 | 108589934591 |
| 12 | 1068719476735 |
| 13 | 10549755813887 |
| 14 | 104398046511103 |
| 15 | 1035184372088831 |
| 16 | 10281474976710655 |
| 17 | 102251799813685247 |