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 | 21 |
| 3 | 881 |
| 4 | 43483 |
| 5 | 1874539 |
| 6 | 60758779 |
| 7 | 1420586923 |
| 8 | 24496279000 |
| 9 | 324818660255 |
| 10 | 3450301922085 |
| 11 | 30392148400009 |
| 12 | 228299392737693 |
| 13 | 1495681511952100 |
| 14 | 8702151387743758 |
| 15 | 45631559860107036 |
| 16 | 218282278670309658 |