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 | 5 |
| 2 | 98 |
| 3 | 3246 |
| 4 | 151064 |
| 5 | 9052120 |
| 6 | 663449040 |
| 7 | 57490690544 |
| 8 | 5749754436992 |
| 9 | 651830574374784 |
| 10 | 82599621627948800 |
| 11 | 11569798584488362240 |
| 12 | 1775052172071446510592 |
| 13 | 296026752508667034942464 |
| 14 | 53320241823337034415908864 |
| 15 | 10315767337287172256717568000 |