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 | 1 |
| 2 | 10 |
| 3 | 40 |
| 4 | 931 |
| 5 | 3871 |
| 6 | 91180 |
| 7 | 379270 |
| 8 | 8934661 |
| 9 | 37164541 |
| 10 | 875505550 |
| 11 | 3641745700 |
| 12 | 85790609191 |
| 13 | 356853914011 |
| 14 | 8406604195120 |
| 15 | 34968041827330 |
| 16 | 823761420512521 |
| 17 | 3426511245164281 |
| 18 | 80720212606031890 |
| 19 | 335763133984272160 |
| 20 | 7909757073970612651 |
| 21 | 32901360619213507351 |