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) |
|---|---|
| 3 | 6 |
| 4 | 96 |
| 5 | 290 |
| 6 | 744 |
| 7 | 1974 |
| 8 | 5376 |
| 9 | 15642 |
| 10 | 45480 |
| 11 | 124014 |
| 12 | 343008 |
| 13 | 944658 |
| 14 | 2596776 |
| 15 | 7116390 |
| 16 | 19409664 |
| 17 | 52694730 |
| 18 | 142812648 |
| 19 | 385840030 |
| 20 | 1039911520 |
| 21 | 2796034626 |
| 22 | 7501233256 |
| 23 | 20084164374 |
| 24 | 53677896192 |
| 25 | 143214557050 |
| 26 | 381504047912 |
| 27 | 1014784646094 |
| 28 | 2695617288672 |
| 29 | 7151420301682 |