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 | 9 |
| 2 | 54 |
| 3 | 135 |
| 4 | 252 |
| 5 | 405 |
| 6 | 594 |
| 7 | 819 |
| 8 | 1080 |
| 9 | 1377 |
| 10 | 1710 |
| 11 | 2079 |
| 12 | 2484 |
| 13 | 2925 |
| 14 | 3402 |
| 15 | 3915 |
| 16 | 4464 |
| 17 | 5049 |
| 18 | 5670 |
| 19 | 6327 |
| 20 | 7020 |
| 21 | 7749 |
| 22 | 8514 |
| 23 | 9315 |
| 24 | 10152 |
| 25 | 11025 |
| 26 | 11934 |
| 27 | 12879 |
| 28 | 13860 |
| 29 | 14877 |
| 30 | 15930 |
| 31 | 17019 |
| 32 | 18144 |
| 33 | 19305 |
| 34 | 20502 |
| 35 | 21735 |
| 36 | 23004 |
| 37 | 24309 |
| 38 | 25650 |
| 39 | 27027 |
| 40 | 28440 |
| 41 | 29889 |
| 42 | 31374 |