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 | 3 |
| 3 | 11 |
| 4 | 43 |
| 5 | 178 |
| 6 | 767 |
| 7 | 3425 |
| 8 | 15783 |
| 9 | 74775 |
| 10 | 363639 |
| 11 | 1811808 |
| 12 | 9239430 |
| 13 | 48175945 |
| 14 | 256658465 |
| 15 | 1396152633 |
| 16 | 7750325528 |
| 17 | 43882706171 |
| 18 | 253308596926 |
| 19 | 1490040961732 |
| 20 | 8928063141435 |
| 21 | 54469529215562 |
| 22 | 338236254603888 |
| 23 | 2136952452531537 |
| 24 | 13731571816349732 |
| 25 | 89710429044324926 |