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 | 21 |
| 4 | 225 |
| 5 | 882 |
| 6 | 2370 |
| 7 | 5175 |
| 8 | 9891 |
| 9 | 17220 |
| 10 | 27972 |
| 11 | 43065 |
| 12 | 63525 |
| 13 | 90486 |
| 14 | 125190 |
| 15 | 168987 |
| 16 | 223335 |
| 17 | 289800 |
| 18 | 370056 |
| 19 | 465885 |
| 20 | 579177 |
| 21 | 711930 |
| 22 | 866250 |
| 23 | 1044351 |
| 24 | 1248555 |
| 25 | 1481292 |
| 26 | 1745100 |
| 27 | 2042625 |
| 28 | 2376621 |
| 29 | 2749950 |
| 30 | 3165582 |
| 31 | 3626595 |
| 32 | 4136175 |
| 33 | 4697616 |
| 34 | 5314320 |