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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 4 |
| 6 | 8 |
| 7 | 24 |
| 8 | 55 |
| 9 | 128 |
| 10 | 282 |
| 11 | 625 |
| 12 | 1336 |
| 13 | 2855 |
| 14 | 6000 |
| 15 | 12551 |
| 16 | 26022 |
| 17 | 53744 |
| 18 | 110361 |
| 19 | 225914 |
| 20 | 460756 |
| 21 | 937413 |
| 22 | 1902370 |
| 23 | 3853445 |
| 24 | 7791647 |
| 25 | 15732468 |
| 26 | 31725191 |
| 27 | 63907437 |
| 28 | 128613224 |
| 29 | 258626480 |
| 30 | 519700800 |
| 31 | 1043690354 |
| 32 | 2094882574 |
| 33 | 4202903667 |
| 34 | 8428794336 |
| 35 | 16897836060 |