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 | 6 |
| 3 | 132 |
| 4 | 6728 |
| 5 | 632970 |
| 6 | 96208632 |
| 7 | 21634786586 |
| 8 | 6765592120576 |
| 9 | 2811089200308642 |
| 10 | 1498814096387846600 |
| 11 | 997811910708863804202 |
| 12 | 811362765374061475234464 |
| 13 | 791392079095826028308709026 |
| 14 | 912043721764132114072259699656 |
| 15 | 1226095938791120621169019081161450 |