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 | 66 |
| 1 | 249 |
| 2 | 1075 |
| 3 | 5133 |
| 4 | 26683 |
| 5 | 149410 |
| 6 | 894124 |
| 7 | 5683643 |
| 8 | 38186471 |
| 9 | 270054693 |
| 10 | 2003233849 |
| 11 | 15539557832 |
| 12 | 125727364954 |
| 13 | 1058517565329 |
| 14 | 9254401000167 |
| 15 | 83864649249661 |
| 16 | 786443164853871 |
| 17 | 7620060523287298 |
| 18 | 76182494678422156 |
| 19 | 784894262599538443 |
| 20 | 8323844770001318027 |
| 21 | 90767456208155581709 |