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 | 3 |
| 3 | 24 |
| 4 | 232 |
| 5 | 2893 |
| 6 | 43763 |
| 7 | 779780 |
| 8 | 15997436 |
| 9 | 371423053 |
| 10 | 9628576947 |
| 11 | 275683093664 |
| 12 | 8640417354592 |
| 13 | 294234689237661 |
| 14 | 10817772136320355 |
| 15 | 427076118244539020 |
| 16 | 18019667955465012596 |
| 17 | 809220593930871751581 |
| 18 | 38537187481365665823843 |
| 19 | 1939882468178947923300136 |