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 | 3 |
| 2 | 5 |
| 3 | 9 |
| 4 | 19 |
| 5 | 39 |
| 6 | 81 |
| 7 | 169 |
| 8 | 351 |
| 9 | 729 |
| 10 | 1517 |
| 11 | 3155 |
| 12 | 6561 |
| 13 | 13648 |
| 14 | 28388 |
| 15 | 59049 |
| 16 | 122827 |
| 17 | 255491 |
| 18 | 531441 |
| 19 | 1105442 |
| 20 | 2299412 |
| 21 | 4782969 |
| 22 | 9948977 |
| 23 | 20694705 |
| 24 | 43046721 |
| 25 | 89540788 |
| 26 | 186252345 |
| 27 | 387420489 |
| 28 | 805867092 |
| 29 | 1676271102 |
| 30 | 3486784401 |
| 31 | 7252803827 |
| 32 | 15086439913 |
| 33 | 31381059609 |