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 | 3 |
| 2 | 6 |
| 3 | 16 |
| 4 | 37 |
| 5 | 147 |
| 6 | 420 |
| 7 | 2290 |
| 8 | 7477 |
| 9 | 50487 |
| 10 | 200910 |
| 11 | 1534220 |
| 12 | 7099871 |
| 13 | 61765581 |
| 14 | 301088574 |
| 15 | 2870376944 |
| 16 | 15554495573 |
| 17 | 167142509403 |
| 18 | 940873745772 |
| 19 | 11097270672382 |
| 20 | 66032188454581 |
| 21 | 807449164097111 |
| 22 | 5147307668890832 |