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 | 6 |
| 3 | 57 |
| 4 | 532 |
| 5 | 12505 |
| 6 | 93786 |
| 7 | 4941265 |
| 8 | 67117128 |
| 9 | 2324524401 |
| 10 | 40000400110 |
| 11 | 2853116706121 |
| 12 | 35664407810076 |
| 13 | 3634501279107049 |
| 14 | 66672041585829330 |
| 15 | 3503151123049919265 |
| 16 | 147573952606856413456 |
| 17 | 13235844190181388226849 |
| 18 | 236078448452969449231206 |
| 19 | 35611553801885644604231641 |