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 | 6 |
| 2 | 24 |
| 3 | 88 |
| 4 | 384 |
| 5 | 1606 |
| 6 | 7138 |
| 7 | 31380 |
| 8 | 141272 |
| 9 | 635686 |
| 10 | 2890884 |
| 11 | 13175784 |
| 12 | 60384934 |
| 13 | 277442652 |
| 14 | 1279055676 |
| 15 | 5909701748 |
| 16 | 27368939688 |
| 17 | 126981852654 |
| 18 | 590182327132 |
| 19 | 2747109920736 |
| 20 | 12804571294224 |
| 21 | 59756343262648 |
| 22 | 279183944932752 |