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 | 144 |
| 3 | 556 |
| 4 | 2239 |
| 5 | 7837 |
| 6 | 22714 |
| 7 | 68737 |
| 8 | 187054 |
| 9 | 505040 |
| 10 | 1346150 |
| 11 | 3472283 |
| 12 | 9030485 |
| 13 | 23093108 |
| 14 | 58964061 |
| 15 | 150498240 |
| 16 | 381786944 |
| 17 | 970985642 |
| 18 | 2462695787 |
| 19 | 6245279141 |
| 20 | 15844141700 |
| 21 | 40148846797 |
| 22 | 101805976056 |
| 23 | 258034064806 |
| 24 | 653990198430 |