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 | 3 |
| 2 | 8 |
| 3 | 17 |
| 4 | 37 |
| 5 | 73 |
| 6 | 151 |
| 7 | 293 |
| 8 | 598 |
| 9 | 1159 |
| 10 | 2358 |
| 11 | 4581 |
| 12 | 9314 |
| 13 | 18143 |
| 14 | 36880 |
| 15 | 72001 |
| 16 | 146325 |
| 17 | 286185 |
| 18 | 581427 |
| 19 | 1138813 |
| 20 | 2312865 |
| 21 | 4535493 |
| 22 | 9207989 |
| 23 | 18074789 |
| 24 | 36682275 |
| 25 | 72066977 |
| 26 | 146206411 |
| 27 | 287454709 |
| 28 | 582979035 |
| 29 | 1146938817 |
| 30 | 2325328271 |
| 31 | 4577459549 |