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 | 3 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 21 |
| 6 | 79 |
| 7 | 75 |
| 8 | 306 |
| 9 | 433 |
| 10 | 1605 |
| 11 | 1695 |
| 12 | 12662 |
| 13 | 10461 |
| 14 | 57759 |
| 15 | 122791 |
| 16 | 347895 |
| 17 | 476049 |
| 18 | 3596917 |
| 19 | 3401967 |
| 20 | 22005312 |
| 21 | 41597289 |
| 22 | 142675887 |
| 23 | 186077883 |
| 24 | 1476684552 |
| 25 | 1694657979 |
| 26 | 8147271993 |
| 27 | 15690973311 |