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 | 3 |
| 2 | 9 |
| 3 | 19 |
| 4 | 21 |
| 5 | 55 |
| 6 | 115 |
| 7 | 193 |
| 8 | 323 |
| 9 | 611 |
| 10 | 1081 |
| 11 | 1571 |
| 12 | 10771 |
| 13 | 13067 |
| 14 | 16321 |
| 15 | 44881 |
| 16 | 57887 |
| 17 | 93167 |
| 18 | 189947 |
| 19 | 404939 |
| 20 | 442307 |
| 21 | 1746551 |
| 22 | 3383593 |
| 23 | 3544391 |
| 24 | 5056787 |
| 25 | 7480667 |
| 26 | 25619213 |
| 27 | 87170987 |
| 28 | 404940757 |
| 29 | 526805663 |
| 30 | 707095391 |
| 31 | 1009465507 |
| 32 | 1048720723 |
| 33 | 5315914139 |