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 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 6 |
| 4 | 12 |
| 5 | 20 |
| 6 | 80 |
| 7 | 152 |
| 8 | 304 |
| 9 | 528 |
| 10 | 2176 |
| 11 | 4416 |
| 12 | 8832 |
| 13 | 15488 |
| 14 | 64768 |
| 15 | 135552 |
| 16 | 271104 |
| 17 | 477440 |
| 18 | 2013184 |
| 19 | 4289536 |
| 20 | 8579072 |
| 21 | 15144960 |
| 22 | 64200704 |
| 23 | 138407936 |
| 24 | 276815872 |
| 25 | 489431040 |
| 26 | 2082406400 |
| 27 | 4526702592 |
| 28 | 9053405184 |
| 29 | 16024403968 |