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 | 1144 |
| 3 | 49742 |
| 4 | 2340135 |
| 5 | 115997970 |
| 6 | 5967382200 |
| 7 | 315614844558 |
| 8 | 17055399281284 |
| 9 | 937581428480312 |
| 10 | 52267355178398304 |
| 11 | 2947837630317717410 |
| 12 | 167897169647656366330 |
| 13 | 9643503773422181941740 |
| 14 | 557939244828083793388560 |
| 15 | 32486374828326106197187470 |