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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 87 |
| 6 | 356 |
| 7 | 1493 |
| 8 | 6398 |
| 9 | 27936 |
| 10 | 123906 |
| 11 | 556734 |
| 12 | 2528668 |
| 13 | 11590555 |
| 14 | 53545932 |
| 15 | 249065874 |
| 16 | 1165482126 |
| 17 | 5482782933 |
| 18 | 25914899804 |
| 19 | 123009541412 |
| 20 | 586121731150 |
| 21 | 2802470267460 |
| 22 | 13441993044464 |
| 23 | 64660400422341 |
| 24 | 311861855749484 |
| 25 | 1507802756171072 |
| 26 | 7306422899878394 |