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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 33 |
| 4 | 244 |
| 5 | 1300 |
| 6 | 4182 |
| 7 | 12201 |
| 8 | 27984 |
| 9 | 61776 |
| 10 | 117700 |
| 11 | 220825 |
| 12 | 374100 |
| 13 | 630708 |
| 14 | 985194 |
| 15 | 1539825 |
| 16 | 2266432 |
| 17 | 3347776 |
| 18 | 4708584 |
| 19 | 6657201 |
| 20 | 9033300 |
| 21 | 12333300 |
| 22 | 16256350 |
| 23 | 21571033 |
| 24 | 27758544 |
| 25 | 35970000 |
| 26 | 45364332 |
| 27 | 57617001 |
| 28 | 71428084 |
| 29 | 89176276 |
| 30 | 108928050 |
| 31 | 133987425 |