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 | 12 |
| 2 | 22 |
| 3 | 42 |
| 4 | 80 |
| 5 | 154 |
| 6 | 296 |
| 7 | 572 |
| 8 | 1104 |
| 9 | 2138 |
| 10 | 4136 |
| 11 | 8020 |
| 12 | 15536 |
| 13 | 30148 |
| 14 | 58450 |
| 15 | 113472 |
| 16 | 220110 |
| 17 | 427410 |
| 18 | 829352 |
| 19 | 1610628 |
| 20 | 3125954 |
| 21 | 6071028 |
| 22 | 11784514 |
| 23 | 22887536 |
| 24 | 44431506 |
| 25 | 86293452 |
| 26 | 167532792 |
| 27 | 325373382 |
| 28 | 631721620 |
| 29 | 1226878704 |
| 30 | 2382108386 |