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 | 2 |
| 2 | 89 |
| 3 | 5039 |
| 4 | 453599 |
| 5 | 4989599 |
| 6 | 2615348735999 |
| 7 | 15205637551103999 |
| 8 | 32327905188896022580370544394201497496149704048639999999999 |
| 9 | 68043117384680383000466155030980344080536633048599859316607515858708885143551999999999999999 |