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 | 11 |
| 2 | 66 |
| 3 | 506 |
| 4 | 3641 |
| 5 | 26818 |
| 6 | 196119 |
| 7 | 1437799 |
| 8 | 10532302 |
| 9 | 77173602 |
| 10 | 565424068 |
| 11 | 4142793511 |
| 12 | 30353430420 |
| 13 | 222394369223 |
| 14 | 1629443428021 |
| 15 | 11938642758854 |
| 16 | 87472304803355 |
| 17 | 640893994357062 |
| 18 | 4695716053827835 |
| 19 | 34404674660198306 |