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 | 4 |
| 1 | 6 |
| 2 | 9 |
| 3 | 13 |
| 4 | 19 |
| 5 | 28 |
| 6 | 41 |
| 7 | 60 |
| 8 | 88 |
| 9 | 129 |
| 10 | 189 |
| 11 | 277 |
| 12 | 406 |
| 13 | 595 |
| 14 | 872 |
| 15 | 1278 |
| 16 | 1873 |
| 17 | 2745 |
| 18 | 4023 |
| 19 | 5896 |
| 20 | 8641 |
| 21 | 12664 |
| 22 | 18560 |
| 23 | 27201 |
| 24 | 39865 |
| 25 | 58425 |
| 26 | 85626 |
| 27 | 125491 |
| 28 | 183916 |
| 29 | 269542 |
| 30 | 395033 |
| 31 | 578949 |
| 32 | 848491 |
| 33 | 1243524 |
| 34 | 1822473 |
| 35 | 2670964 |
| 36 | 3914488 |
| 37 | 5736961 |
| 38 | 8407925 |
| 39 | 12322413 |
| 40 | 18059374 |