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 | 40 |
| 2 | 1601 |
| 3 | 64080 |
| 4 | 2564801 |
| 5 | 102656120 |
| 6 | 4108809601 |
| 7 | 164455040160 |
| 8 | 6582310416001 |
| 9 | 263456871680200 |
| 10 | 10544857177624001 |
| 11 | 422057743976640240 |
| 12 | 16892854616243233601 |
| 13 | 676136242393705984280 |
| 14 | 27062342550364482604801 |
| 15 | 1083169838256973010176320 |