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 | 3 |
| 5 | 17 |
| 6 | 51 |
| 7 | 120 |
| 8 | 240 |
| 9 | 432 |
| 10 | 720 |
| 11 | 1131 |
| 12 | 1697 |
| 13 | 2451 |
| 14 | 3432 |
| 15 | 4680 |
| 16 | 6240 |
| 17 | 8160 |
| 18 | 10491 |
| 19 | 13289 |
| 20 | 16611 |
| 21 | 20520 |
| 22 | 25080 |
| 23 | 30360 |
| 24 | 36432 |
| 25 | 43371 |
| 26 | 51257 |
| 27 | 60171 |
| 28 | 70200 |
| 29 | 81432 |
| 30 | 93960 |
| 31 | 107880 |
| 32 | 123291 |
| 33 | 140297 |
| 34 | 159003 |