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 | 1 |
| 2 | 10 |
| 3 | 350 |
| 4 | 29400 |
| 5 | 4851000 |
| 6 | 1387386000 |
| 7 | 631260630000 |
| 8 | 429257228400000 |
| 9 | 415950254319600000 |
| 10 | 553213838245068000000 |
| 11 | 979741707532015428000000 |
| 12 | 2253405927323635484400000000 |
| 13 | 6591212337421633791870000000000 |
| 14 | 24084289880938649875492980000000000 |
| 15 | 108258883014819231190340945100000000000 |