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 | 4 |
| 2 | 169 |
| 3 | 7141 |
| 4 | 301741 |
| 5 | 12749989 |
| 6 | 538747549 |
| 7 | 22764640981 |
| 8 | 961914128461 |
| 9 | 40645437426949 |
| 10 | 1717462645311229 |
| 11 | 72570948297479221 |
| 12 | 3066467006530462381 |
| 13 | 129572785291363217509 |
| 14 | 5475065165353811151709 |
| 15 | 231347489347123368595861 |
| 16 | 9775529461439509493215501 |