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 | 55 |
| 2 | 4895 |
| 3 | 352440 |
| 4 | 27372840 |
| 5 | 2063912136 |
| 6 | 157373300370 |
| 7 | 11948265189630 |
| 8 | 908637119420910 |
| 9 | 69056421075989160 |
| 10 | 5249543573067466872 |
| 11 | 399024295188779925720 |
| 12 | 30331388438447118520355 |
| 13 | 2305576054220330112077285 |
| 14 | 175254358052498673797874685 |
| 15 | 13321629629800423781409595728 |