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 | 33 |
| 3 | 262 |
| 4 | 2145 |
| 5 | 16182 |
| 6 | 116353 |
| 7 | 821142 |
| 8 | 5760705 |
| 9 | 40347046 |
| 10 | 282465249 |
| 11 | 1977312102 |
| 12 | 13841266465 |
| 13 | 96888981846 |
| 14 | 678223034433 |
| 15 | 4747561459318 |
| 16 | 33232930504065 |
| 17 | 232630513903686 |
| 18 | 1628413597805473 |
| 19 | 11398895185242822 |