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 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 97 |
| 5 | 241 |
| 6 | 2521 |
| 7 | 16022 |
| 8 | 26603 |
| 9 | 39343 |
| 10 | 104659 |
| 11 | 248407 |
| 12 | 506509 |
| 13 | 584213 |
| 14 | 2560177 |
| 15 | 4036967 |
| 16 | 4417813 |
| 17 | 5167587 |
| 18 | 9725107 |
| 19 | 25045771 |
| 20 | 27489679 |
| 21 | 70416259 |
| 22 | 111555371 |
| 23 | 174266683 |
| 24 | 359589563 |
| 25 | 1075714923 |
| 26 | 6820213333 |
| 27 | 15378035161 |
| 28 | 16598109467 |
| 29 | 19423306039 |
| 30 | 30133946677 |
| 31 | 74466436042 |