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 | 6 |
| 1 | 13 |
| 2 | 30 |
| 3 | 76 |
| 4 | 216 |
| 5 | 688 |
| 6 | 2400 |
| 7 | 8896 |
| 8 | 34176 |
| 9 | 133888 |
| 10 | 529920 |
| 11 | 2108416 |
| 12 | 8411136 |
| 13 | 33599488 |
| 14 | 134307840 |
| 15 | 537051136 |
| 16 | 2147844096 |
| 17 | 8590655488 |
| 18 | 34361180160 |
| 19 | 137441837056 |
| 20 | 549761581056 |
| 21 | 2199034789888 |
| 22 | 8796116090880 |
| 23 | 35184418226176 |
| 24 | 140737580630016 |
| 25 | 562950137970688 |