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 | 3 |
| 2 | 24 |
| 3 | 276 |
| 4 | 4086 |
| 5 | 73620 |
| 6 | 1557702 |
| 7 | 37770138 |
| 8 | 1030916484 |
| 9 | 31245154164 |
| 10 | 1040274476208 |
| 11 | 37716394860936 |
| 12 | 1478413316987424 |
| 13 | 62274364390387656 |
| 14 | 2804282634867538248 |
| 15 | 134397620584518275928 |
| 16 | 6828489621874434752208 |
| 17 | 366547074721109281366128 |