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 | 2 |
| 3 | 33 |
| 4 | 308 |
| 5 | 1300 |
| 6 | 4668 |
| 7 | 12201 |
| 8 | 30032 |
| 9 | 61776 |
| 10 | 123950 |
| 11 | 220825 |
| 12 | 389652 |
| 13 | 630708 |
| 14 | 1018808 |
| 15 | 1539825 |
| 16 | 2331968 |
| 17 | 3347776 |
| 18 | 4826682 |
| 19 | 6657201 |
| 20 | 9233300 |
| 21 | 12333300 |
| 22 | 16578452 |
| 23 | 21571033 |
| 24 | 28256208 |
| 25 | 35970000 |
| 26 | 46106918 |
| 27 | 57617001 |
| 28 | 72503732 |
| 29 | 89176276 |
| 30 | 110446800 |
| 31 | 133987425 |