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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 7 |
| 6 | 9 |
| 7 | 19 |
| 8 | 25 |
| 9 | 53 |
| 10 | 71 |
| 11 | 149 |
| 12 | 203 |
| 13 | 423 |
| 14 | 583 |
| 15 | 1209 |
| 16 | 1681 |
| 17 | 3473 |
| 18 | 4863 |
| 19 | 10017 |
| 20 | 14107 |
| 21 | 28987 |
| 22 | 41019 |
| 23 | 84113 |
| 24 | 119513 |
| 25 | 244645 |
| 26 | 348829 |
| 27 | 712987 |
| 28 | 1019731 |
| 29 | 2081547 |
| 30 | 2985097 |
| 31 | 6086375 |
| 32 | 8749185 |
| 33 | 17820657 |
| 34 | 25671983 |
| 35 | 52241825 |
| 36 | 75402907 |
| 37 | 153316715 |
| 38 | 221673707 |
| 39 | 450393329 |
| 40 | 652234089 |