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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 149 |
| 5 | 2316 |
| 6 | 59047 |
| 7 | 2429554 |
| 8 | 159549945 |
| 9 | 16557985432 |
| 10 | 2693862309131 |
| 11 | 682199144788734 |
| 12 | 267277518618047797 |
| 13 | 161130714885281760100 |
| 14 | 148762112860064623199295 |
| 15 | 209444428223095096806228346 |
| 16 | 447998198975235291015396393713 |
| 17 | 1450973400598977755884988875863216 |