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 | 0 |
| 2 | 10 |
| 3 | 175 |
| 4 | 1225 |
| 5 | 5565 |
| 6 | 19425 |
| 7 | 56595 |
| 8 | 144375 |
| 9 | 332475 |
| 10 | 705705 |
| 11 | 1401400 |
| 12 | 2632630 |
| 13 | 4718350 |
| 14 | 8121750 |
| 15 | 13498170 |
| 16 | 21754050 |
| 17 | 34118490 |
| 18 | 52229100 |
| 19 | 78233925 |
| 20 | 114911335 |
| 21 | 165809875 |
| 22 | 235410175 |
| 23 | 329311125 |
| 24 | 454442625 |
| 25 | 619307325 |
| 26 | 834253875 |
| 27 | 1111784310 |