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 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 20 |
| 6 | 44 |
| 7 | 88 |
| 8 | 182 |
| 9 | 364 |
| 10 | 740 |
| 11 | 1484 |
| 12 | 2990 |
| 13 | 5992 |
| 14 | 12030 |
| 15 | 24092 |
| 16 | 48278 |
| 17 | 96628 |
| 18 | 193458 |
| 19 | 387052 |
| 20 | 774486 |
| 21 | 1549220 |
| 22 | 3099106 |
| 23 | 6198632 |
| 24 | 12398466 |
| 25 | 24797384 |
| 26 | 49596654 |
| 27 | 99193464 |
| 28 | 198389538 |
| 29 | 396777716 |
| 30 | 793557898 |
| 31 | 1587108968 |
| 32 | 3174217032 |
| 33 | 6348411948 |
| 34 | 12696809070 |