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 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 62 |
| 5 | 532 |
| 6 | 4846 |
| 7 | 45712 |
| 8 | 441458 |
| 9 | 4337468 |
| 10 | 43187630 |
| 11 | 434602280 |
| 12 | 4411598154 |
| 13 | 45107210436 |
| 14 | 464047175770 |
| 15 | 4799184825632 |
| 16 | 49860914628042 |
| 17 | 520109726201420 |
| 18 | 5444641096394926 |
| 19 | 57176049036449464 |
| 20 | 602125661090565914 |
| 21 | 6357215467283967404 |
| 22 | 67274331104623532042 |