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 | 6 |
| 2 | 146 |
| 3 | 1618 |
| 4 | 14248 |
| 5 | 111030 |
| 6 | 801756 |
| 7 | 5493524 |
| 8 | 36213404 |
| 9 | 231727206 |
| 10 | 1448346368 |
| 11 | 8882264970 |
| 12 | 53630707124 |
| 13 | 319658314238 |
| 14 | 1884696886358 |
| 15 | 11010327107946 |
| 16 | 63818465537674 |
| 17 | 367417387464528 |
| 18 | 2102996368589366 |
| 19 | 11976130801913690 |
| 20 | 67900925937645280 |
| 21 | 383491738397537356 |