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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 8 |
| 7 | 20 |
| 8 | 48 |
| 9 | 111 |
| 10 | 251 |
| 11 | 558 |
| 12 | 1224 |
| 13 | 2656 |
| 14 | 5713 |
| 15 | 12199 |
| 16 | 25888 |
| 17 | 54648 |
| 18 | 114832 |
| 19 | 240335 |
| 20 | 501239 |
| 21 | 1042126 |
| 22 | 2160676 |
| 23 | 4468664 |
| 24 | 9221281 |
| 25 | 18989899 |
| 26 | 39034824 |
| 27 | 80103276 |
| 28 | 164126496 |
| 29 | 335808927 |
| 30 | 686182387 |
| 31 | 1400438814 |
| 32 | 2854992080 |
| 33 | 5814293120 |
| 34 | 11829648225 |
| 35 | 24046855887 |
| 36 | 48840756608 |