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 | 126 |
| 1 | 1050 |
| 2 | 4950 |
| 3 | 17325 |
| 4 | 50050 |
| 5 | 126126 |
| 6 | 286650 |
| 7 | 600600 |
| 8 | 1178100 |
| 9 | 2187900 |
| 10 | 3879876 |
| 11 | 6613425 |
| 12 | 10892700 |
| 13 | 17409700 |
| 14 | 27096300 |
| 15 | 41186376 |
| 16 | 61289250 |
| 17 | 89475750 |
| 18 | 128378250 |
| 19 | 181306125 |
| 20 | 252378126 |
| 21 | 346673250 |
| 22 | 470401750 |
| 23 | 631098000 |
| 24 | 837837000 |
| 25 | 1101476376 |
| 26 | 1434925800 |