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 | 30 |
| 2 | 178 |
| 3 | -37980 |
| 4 | -1524948 |
| 5 | 63937800 |
| 6 | 7423196280 |
| 7 | -54282661200 |
| 8 | -39145313835120 |
| 9 | -860822763962400 |
| 10 | 228541566381737760 |
| 11 | 13071387347260660800 |
| 12 | -1422935499785941465920 |
| 13 | -155938564970244609148800 |
| 14 | 8677515651883508324661120 |
| 15 | 1836552484275737759015904000 |