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 | 1 |
| 2 | 5 |
| 3 | 16 |
| 4 | 44 |
| 5 | 112 |
| 6 | 272 |
| 7 | 640 |
| 8 | 1472 |
| 9 | 3328 |
| 10 | 7424 |
| 11 | 16384 |
| 12 | 35840 |
| 13 | 77824 |
| 14 | 167936 |
| 15 | 360448 |
| 16 | 770048 |
| 17 | 1638400 |
| 18 | 3473408 |
| 19 | 7340032 |
| 20 | 15466496 |
| 21 | 32505856 |
| 22 | 68157440 |
| 23 | 142606336 |
| 24 | 297795584 |
| 25 | 620756992 |
| 26 | 1291845632 |
| 27 | 2684354560 |
| 28 | 5570035712 |
| 29 | 11542724608 |
| 30 | 23890755584 |
| 31 | 49392123904 |