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 | 0 |
| 2 | 3 |
| 3 | 6 |
| 4 | 18 |
| 5 | 39 |
| 6 | 96 |
| 7 | 201 |
| 8 | 582 |
| 9 | 1220 |
| 10 | 2590 |
| 11 | 5345 |
| 12 | 10919 |
| 13 | 21859 |
| 14 | 44167 |
| 15 | 88629 |
| 16 | 178050 |
| 17 | 356598 |
| 18 | 715084 |
| 19 | 1431514 |
| 20 | 2866876 |
| 21 | 5736311 |
| 22 | 11480839 |
| 23 | 22966942 |
| 24 | 45949687 |
| 25 | 91910241 |
| 26 | 183852468 |
| 27 | 367726473 |
| 28 | 735517466 |
| 29 | 1471078571 |
| 30 | 2942286009 |
| 31 | 5884661772 |
| 32 | 11769583511 |
| 33 | 23539346216 |
| 34 | 47079214312 |
| 35 | 94158788295 |