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 | 3 |
| 1 | 7 |
| 2 | 44 |
| 3 | 375 |
| 4 | 3724 |
| 5 | 40572 |
| 6 | 470448 |
| 7 | 5705271 |
| 8 | 71571500 |
| 9 | 921922716 |
| 10 | 12130541488 |
| 11 | 162422308412 |
| 12 | 2206718599344 |
| 13 | 30354522550000 |
| 14 | 422005129502400 |
| 15 | 5921371233163575 |
| 16 | 83761043464536300 |
| 17 | 1193351781764231100 |
| 18 | 17110404580326750000 |
| 19 | 246734315435589111900 |