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 | 1 |
| 2 | 15 |
| 3 | 275 |
| 4 | 5500 |
| 5 | 115500 |
| 6 | 2502500 |
| 7 | 55412500 |
| 8 | 1246781250 |
| 9 | 28398906250 |
| 10 | 653174843750 |
| 11 | 15141780468750 |
| 12 | 353308210937500 |
| 13 | 8289154179687500 |
| 14 | 195387205664062500 |
| 15 | 4624163867382812500 |
| 16 | 109823891850341796875 |