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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 27 |
| 6 | 51 |
| 7 | 99 |
| 8 | 195 |
| 9 | 387 |
| 10 | 771 |
| 11 | 1539 |
| 12 | 3075 |
| 13 | 6147 |
| 14 | 12291 |
| 15 | 24579 |
| 16 | 49155 |
| 17 | 98307 |
| 18 | 196611 |
| 19 | 393219 |
| 20 | 786435 |
| 21 | 1572867 |
| 22 | 3145731 |
| 23 | 6291459 |
| 24 | 12582915 |
| 25 | 25165827 |
| 26 | 50331651 |
| 27 | 100663299 |
| 28 | 201326595 |
| 29 | 402653187 |
| 30 | 805306371 |
| 31 | 1610612739 |
| 32 | 3221225475 |