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 | 1 |
| 2 | 33 |
| 3 | 276 |
| 4 | 1300 |
| 5 | 4425 |
| 6 | 12201 |
| 7 | 29008 |
| 8 | 61776 |
| 9 | 120825 |
| 10 | 220825 |
| 11 | 381876 |
| 12 | 630708 |
| 13 | 1002001 |
| 14 | 1539825 |
| 15 | 2299200 |
| 16 | 3347776 |
| 17 | 4767633 |
| 18 | 6657201 |
| 19 | 9133300 |
| 20 | 12333300 |
| 21 | 16417401 |
| 22 | 21571033 |
| 23 | 28007376 |
| 24 | 35970000 |
| 25 | 45735625 |
| 26 | 57617001 |
| 27 | 71965908 |
| 28 | 89176276 |
| 29 | 109687425 |
| 30 | 133987425 |
| 31 | 162616576 |