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 | 1 |
| 3 | 6 |
| 4 | 18 |
| 5 | 50 |
| 6 | 120 |
| 7 | 273 |
| 8 | 588 |
| 9 | 1224 |
| 10 | 2475 |
| 11 | 4895 |
| 12 | 9504 |
| 13 | 18174 |
| 14 | 34307 |
| 15 | 64050 |
| 16 | 118440 |
| 17 | 217192 |
| 18 | 395352 |
| 19 | 714951 |
| 20 | 1285350 |
| 21 | 2298660 |
| 22 | 4091241 |
| 23 | 7250221 |
| 24 | 12797568 |
| 25 | 22507500 |
| 26 | 39452725 |
| 27 | 68942718 |
| 28 | 120132558 |
| 29 | 208776974 |
| 30 | 361937400 |
| 31 | 626015085 |
| 32 | 1080441264 |