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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 2 |
| 11 | 4 |
| 12 | 8 |
| 13 | 15 |
| 14 | 30 |
| 15 | 60 |
| 16 | 120 |
| 17 | 240 |
| 18 | 480 |
| 19 | 959 |
| 20 | 1916 |
| 21 | 3828 |
| 22 | 7648 |
| 23 | 15281 |
| 24 | 30532 |
| 25 | 61004 |
| 26 | 121888 |
| 27 | 243536 |
| 28 | 486592 |
| 29 | 972225 |
| 30 | 1942534 |
| 31 | 3881240 |
| 32 | 7754832 |
| 33 | 15494383 |
| 34 | 30958234 |
| 35 | 61855464 |
| 36 | 123589040 |
| 37 | 246934544 |
| 38 | 493382496 |
| 39 | 985792767 |
| 40 | 1969643000 |