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 | 171 |
| 3 | 4945 |
| 4 | 331133 |
| 5 | 17508475 |
| 6 | 1017093992 |
| 7 | 57228320561 |
| 8 | 3263262629905 |
| 9 | 185175369431551 |
| 10 | 10529540995776143 |
| 11 | 598275977865042347 |
| 12 | 34004634498887815603 |
| 13 | 1932504421503220832048 |
| 14 | 109831420296006021851427 |
| 15 | 6242000703148139096486777 |
| 16 | 354752087455830720672222391 |