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 | 1 |
| 1 | 140 |
| 2 | 11550 |
| 3 | 735000 |
| 4 | 39991875 |
| 5 | 1960612500 |
| 6 | 89303500000 |
| 7 | 3853850000000 |
| 8 | 159664583203125 |
| 9 | 6409926960937500 |
| 10 | 251055710800781250 |
| 11 | 9641722822265625000 |
| 12 | 364483553427490234375 |
| 13 | 13602971247133789062500 |
| 14 | 502386213470141601562500 |
| 15 | 18394848021467285156250000 |