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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 4 |
| 16 | 10 |
| 17 | 30 |
| 18 | 66 |
| 19 | 144 |
| 20 | 314 |
| 21 | 692 |
| 22 | 1452 |
| 23 | 3046 |
| 24 | 6388 |
| 25 | 13298 |
| 26 | 27274 |
| 27 | 56164 |
| 28 | 113672 |
| 29 | 231892 |
| 30 | 470984 |
| 31 | 950178 |
| 32 | 1912700 |
| 33 | 3868034 |
| 34 | 7772172 |
| 35 | 15651674 |
| 36 | 31464544 |
| 37 | 63154106 |
| 38 | 126603428 |
| 39 | 254088618 |
| 40 | 508541874 |
| 41 | 1018817124 |