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 | 1 |
| 1 | 15 |
| 2 | 50 |
| 3 | 225 |
| 4 | 590 |
| 5 | 1485 |
| 6 | 3130 |
| 7 | 6435 |
| 8 | 11931 |
| 9 | 21450 |
| 10 | 36220 |
| 11 | 59670 |
| 12 | 94140 |
| 13 | 145350 |
| 14 | 217500 |
| 15 | 319770 |
| 16 | 458981 |
| 17 | 648945 |
| 18 | 900350 |
| 19 | 1233375 |
| 20 | 1663850 |
| 21 | 2220075 |
| 22 | 2924870 |
| 23 | 3817125 |
| 24 | 4928511 |
| 25 | 6310980 |
| 26 | 8007640 |
| 27 | 10086780 |
| 28 | 12605560 |
| 29 | 15651900 |
| 30 | 19300440 |
| 31 | 23662980 |
| 32 | 28835081 |