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 | 9 |
| 2 | 41 |
| 3 | 97 |
| 4 | 341 |
| 5 | 1003 |
| 6 | 3129 |
| 7 | 9439 |
| 8 | 28717 |
| 9 | 86695 |
| 10 | 261789 |
| 11 | 788373 |
| 12 | 2372693 |
| 13 | 7133179 |
| 14 | 21434717 |
| 15 | 64377579 |
| 16 | 193296317 |
| 17 | 580236633 |
| 18 | 1741470477 |
| 19 | 5226041293 |
| 20 | 15681654949 |
| 21 | 47052540983 |
| 22 | 141173946441 |
| 23 | 423556852705 |
| 24 | 1270745764685 |
| 25 | 3812398439683 |