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 | 2 |
| 2 | 6 |
| 3 | 18 |
| 4 | 44 |
| 5 | 110 |
| 6 | 216 |
| 7 | 498 |
| 8 | 1030 |
| 9 | 2166 |
| 10 | 4494 |
| 11 | 9382 |
| 12 | 19256 |
| 13 | 39794 |
| 14 | 81452 |
| 15 | 166520 |
| 16 | 339588 |
| 17 | 691850 |
| 18 | 1405540 |
| 19 | 2856000 |
| 20 | 5793242 |
| 21 | 11743728 |
| 22 | 23782412 |
| 23 | 48133328 |
| 24 | 97335320 |
| 25 | 196737218 |
| 26 | 397413614 |
| 27 | 802432322 |
| 28 | 1619527864 |
| 29 | 3267496300 |
| 30 | 6590092572 |
| 31 | 13287437168 |
| 32 | 26783489454 |