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 | 63 |
| 2 | 124 |
| 3 | 245 |
| 4 | 484 |
| 5 | 956 |
| 6 | 1888 |
| 7 | 3728 |
| 8 | 7362 |
| 9 | 14539 |
| 10 | 28712 |
| 11 | 56701 |
| 12 | 111974 |
| 13 | 221128 |
| 14 | 436688 |
| 15 | 862380 |
| 16 | 1703044 |
| 17 | 3363203 |
| 18 | 6641716 |
| 19 | 13116185 |
| 20 | 25902088 |
| 21 | 51151928 |
| 22 | 101015784 |
| 23 | 199487860 |
| 24 | 393952358 |
| 25 | 777984487 |
| 26 | 1536378320 |
| 27 | 3034068649 |