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 | 6 |
| 2 | 132 |
| 3 | 1044 |
| 4 | 4776 |
| 5 | 15960 |
| 6 | 43416 |
| 7 | 102144 |
| 8 | 215712 |
| 9 | 419040 |
| 10 | 761520 |
| 11 | 1310628 |
| 12 | 2155752 |
| 13 | 3412656 |
| 14 | 5228076 |
| 15 | 7784910 |
| 16 | 11307648 |
| 17 | 16068264 |
| 18 | 22392504 |
| 19 | 30666570 |
| 20 | 41344080 |
| 21 | 54953640 |
| 22 | 72106452 |
| 23 | 93504798 |
| 24 | 119950416 |
| 25 | 152353650 |
| 26 | 191742720 |
| 27 | 239273514 |
| 28 | 296239776 |
| 29 | 364083690 |