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 | 5 |
| 2 | 54 |
| 3 | 288 |
| 4 | 1536 |
| 5 | 8192 |
| 6 | 43712 |
| 7 | 235072 |
| 8 | 1264832 |
| 9 | 6809856 |
| 10 | 36666496 |
| 11 | 197447168 |
| 12 | 1063304448 |
| 13 | 5726352128 |
| 14 | 30839264512 |
| 15 | 166086172928 |
| 16 | 894467665408 |
| 17 | 4817222467584 |
| 18 | 25943536156672 |
| 19 | 139721052861440 |
| 20 | 752479440667648 |