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 | 2 |
| 2 | 9 |
| 3 | 57 |
| 4 | 464 |
| 5 | 4593 |
| 6 | 53381 |
| 7 | 711056 |
| 8 | 10665071 |
| 9 | 177698377 |
| 10 | 3253933294 |
| 11 | 64917524367 |
| 12 | 1400923403957 |
| 13 | 32503510579738 |
| 14 | 806599849548101 |
| 15 | 21313355891736741 |
| 16 | 597326671763101944 |