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 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 24 |
| 4 | 76 |
| 5 | 232 |
| 6 | 708 |
| 7 | 2144 |
| 8 | 6476 |
| 9 | 19512 |
| 10 | 58708 |
| 11 | 176464 |
| 12 | 530076 |
| 13 | 1591592 |
| 14 | 4777508 |
| 15 | 14337984 |
| 16 | 43024876 |
| 17 | 129096472 |
| 18 | 387333108 |
| 19 | 1162086704 |
| 20 | 3486434876 |
| 21 | 10459654152 |
| 22 | 31379661508 |
| 23 | 94140382624 |
| 24 | 282423944076 |
| 25 | 847277424632 |