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 | 21 |
| 3 | 146 |
| 4 | 981 |
| 5 | 6222 |
| 6 | 38921 |
| 7 | 239946 |
| 8 | 1469826 |
| 9 | 8957976 |
| 10 | 54420339 |
| 11 | 329815506 |
| 12 | 1995387801 |
| 13 | 12056025246 |
| 14 | 72766743801 |
| 15 | 438839319470 |
| 16 | 2644790643216 |
| 17 | 15930973595046 |
| 18 | 95917737415956 |
| 19 | 577288174746786 |
| 20 | 3473350521083199 |
| 21 | 20892333943230346 |
| 22 | 125638899138654861 |