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 | 2 |
| 3 | 13 |
| 4 | 26 |
| 5 | 205 |
| 6 | 410 |
| 7 | 3277 |
| 8 | 6554 |
| 9 | 52429 |
| 10 | 104858 |
| 11 | 838861 |
| 12 | 1677722 |
| 13 | 13421773 |
| 14 | 26843546 |
| 15 | 214748365 |
| 16 | 429496730 |
| 17 | 3435973837 |
| 18 | 6871947674 |
| 19 | 54975581389 |
| 20 | 109951162778 |
| 21 | 879609302221 |
| 22 | 1759218604442 |
| 23 | 14073748835533 |
| 24 | 28147497671066 |