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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 28 |
| 6 | 448 |
| 7 | 18788 |
| 8 | 1419852 |
| 9 | 207249896 |
| 10 | 58206408344 |
| 11 | 31725488477648 |
| 12 | 33830818147141904 |
| 13 | 71068681534173472576 |
| 14 | 295648155633330113713344 |
| 15 | 2444510010072634827916776064 |
| 16 | 40269686339597630128483872278656 |
| 17 | 1323732128140903183968664175047409152 |