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 | 21 |
| 3 | 292 |
| 4 | 1566 |
| 5 | 5664 |
| 6 | 16375 |
| 7 | 40716 |
| 8 | 90552 |
| 9 | 184576 |
| 10 | 350649 |
| 11 | 628500 |
| 12 | 1072786 |
| 13 | 1756512 |
| 14 | 2774811 |
| 15 | 4249084 |
| 16 | 6331500 |
| 17 | 9209856 |
| 18 | 13112797 |
| 19 | 18315396 |
| 20 | 25145094 |
| 21 | 33988000 |
| 22 | 45295551 |
| 23 | 59591532 |
| 24 | 77479456 |
| 25 | 99650304 |
| 26 | 126890625 |
| 27 | 160090996 |
| 28 | 200254842 |
| 29 | 248507616 |