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 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 28 |
| 6 | 56 |
| 7 | 120 |
| 8 | 240 |
| 9 | 480 |
| 10 | 960 |
| 11 | 1984 |
| 12 | 3968 |
| 13 | 8064 |
| 14 | 16128 |
| 15 | 32256 |
| 16 | 64512 |
| 17 | 130048 |
| 18 | 260096 |
| 19 | 522240 |
| 20 | 1044480 |
| 21 | 2088960 |
| 22 | 4177920 |
| 23 | 8372224 |
| 24 | 16744448 |
| 25 | 33488896 |
| 26 | 66977792 |
| 27 | 133955584 |
| 28 | 267911168 |
| 29 | 536346624 |
| 30 | 1072693248 |
| 31 | 2146435072 |
| 32 | 4292870144 |
| 33 | 8585740288 |