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 | 12 |
| 2 | 32 |
| 3 | 90 |
| 4 | 256 |
| 5 | 732 |
| 6 | 2102 |
| 7 | 6060 |
| 8 | 17536 |
| 9 | 50922 |
| 10 | 148352 |
| 11 | 433500 |
| 12 | 1270246 |
| 13 | 3731532 |
| 14 | 10987232 |
| 15 | 32418810 |
| 16 | 95835136 |
| 17 | 283784412 |
| 18 | 841611542 |
| 19 | 2499330540 |
| 20 | 7431221056 |
| 21 | 22118855562 |
| 22 | 65898914432 |
| 23 | 196498594140 |
| 24 | 586358987206 |
| 25 | 1750864725132 |
| 26 | 5231094261152 |
| 27 | 15636995277210 |