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) |
|---|---|
| 0 | 19 |
| 1 | 38 |
| 2 | 76 |
| 3 | 152 |
| 4 | 304 |
| 5 | 608 |
| 6 | 1216 |
| 7 | 2432 |
| 8 | 4864 |
| 9 | 9728 |
| 10 | 19456 |
| 11 | 38912 |
| 12 | 77824 |
| 13 | 155648 |
| 14 | 311296 |
| 15 | 622592 |
| 16 | 1245184 |
| 17 | 2490368 |
| 18 | 4980736 |
| 19 | 9961472 |
| 20 | 19922944 |
| 21 | 39845888 |
| 22 | 79691776 |
| 23 | 159383552 |
| 24 | 318767104 |
| 25 | 637534208 |
| 26 | 1275068416 |
| 27 | 2550136832 |
| 28 | 5100273664 |
| 29 | 10200547328 |
| 30 | 20401094656 |