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 | 6 |
| 2 | 73 |
| 3 | 444 |
| 4 | 5401 |
| 5 | 32850 |
| 6 | 399601 |
| 7 | 2430456 |
| 8 | 29565073 |
| 9 | 179820894 |
| 10 | 2187415801 |
| 11 | 13304315700 |
| 12 | 161839204201 |
| 13 | 984339540906 |
| 14 | 11973913695073 |
| 15 | 72827821711344 |
| 16 | 885907774231201 |
| 17 | 5388274467098550 |
| 18 | 65545201379413801 |
| 19 | 398659482743581356 |
| 20 | 4849458994302390073 |