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 | 6 |
| 3 | 14 |
| 4 | 46 |
| 5 | 137 |
| 6 | 354 |
| 7 | 905 |
| 8 | 2366 |
| 9 | 6278 |
| 10 | 16681 |
| 11 | 44156 |
| 12 | 116650 |
| 13 | 308180 |
| 14 | 814645 |
| 15 | 2153984 |
| 16 | 5695102 |
| 17 | 15056494 |
| 18 | 39804582 |
| 19 | 105231559 |
| 20 | 278204561 |
| 21 | 735502187 |
| 22 | 1944477640 |
| 23 | 5140687360 |
| 24 | 13590620330 |
| 25 | 35930023287 |
| 26 | 94989547620 |
| 27 | 251127430313 |
| 28 | 663914974741 |