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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 16 |
| 8 | 148 |
| 9 | 756 |
| 10 | 2820 |
| 11 | 8580 |
| 12 | 22572 |
| 13 | 53224 |
| 14 | 115036 |
| 15 | 231960 |
| 16 | 441032 |
| 17 | 799064 |
| 18 | 1387368 |
| 19 | 2324744 |
| 20 | 3771176 |
| 21 | 5952528 |
| 22 | 9159392 |
| 23 | 13791008 |
| 24 | 20340036 |
| 25 | 29476508 |
| 26 | 41992820 |
| 27 | 58953420 |
| 28 | 81591788 |
| 29 | 111535064 |
| 30 | 150611100 |
| 31 | 201257608 |