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 | 3 |
| 2 | 9 |
| 3 | 24 |
| 4 | 56 |
| 5 | 136 |
| 6 | 328 |
| 7 | 792 |
| 8 | 1912 |
| 9 | 4616 |
| 10 | 11144 |
| 11 | 26904 |
| 12 | 64952 |
| 13 | 156808 |
| 14 | 378568 |
| 15 | 913944 |
| 16 | 2206456 |
| 17 | 5326856 |
| 18 | 12860168 |
| 19 | 31047192 |
| 20 | 74954552 |
| 21 | 180956296 |
| 22 | 436867144 |
| 23 | 1054690584 |
| 24 | 2546248312 |
| 25 | 6147187208 |
| 26 | 14840622728 |
| 27 | 35828432664 |
| 28 | 86497488056 |
| 29 | 208823408776 |
| 30 | 504144305608 |