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 | 4 |
| 2 | 8 |
| 3 | 14 |
| 4 | 28 |
| 5 | 50 |
| 6 | 100 |
| 7 | 180 |
| 8 | 360 |
| 9 | 650 |
| 10 | 1300 |
| 11 | 2350 |
| 12 | 4700 |
| 13 | 8500 |
| 14 | 17000 |
| 15 | 30750 |
| 16 | 61500 |
| 17 | 111250 |
| 18 | 222500 |
| 19 | 402500 |
| 20 | 805000 |
| 21 | 1456250 |
| 22 | 2912500 |
| 23 | 5268750 |
| 24 | 10537500 |
| 25 | 19062500 |
| 26 | 38125000 |
| 27 | 68968750 |
| 28 | 137937500 |
| 29 | 249531250 |
| 30 | 499062500 |
| 31 | 902812500 |
| 32 | 1805625000 |