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 | 3 |
| 2 | 12 |
| 3 | 33 |
| 4 | 72 |
| 5 | 135 |
| 6 | 228 |
| 7 | 357 |
| 8 | 528 |
| 9 | 747 |
| 10 | 1020 |
| 11 | 1353 |
| 12 | 1752 |
| 13 | 2223 |
| 14 | 2772 |
| 15 | 3405 |
| 16 | 4128 |
| 17 | 4947 |
| 18 | 5868 |
| 19 | 6897 |
| 20 | 8040 |
| 21 | 9303 |
| 22 | 10692 |
| 23 | 12213 |
| 24 | 13872 |
| 25 | 15675 |
| 26 | 17628 |
| 27 | 19737 |
| 28 | 22008 |
| 29 | 24447 |
| 30 | 27060 |
| 31 | 29853 |
| 32 | 32832 |
| 33 | 36003 |
| 34 | 39372 |
| 35 | 42945 |
| 36 | 46728 |
| 37 | 50727 |
| 38 | 54948 |
| 39 | 59397 |
| 40 | 64080 |
| 41 | 69003 |
| 42 | 74172 |