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) |
|---|---|
| 5 | 1 |
| 6 | 3 |
| 7 | 13 |
| 8 | 49 |
| 9 | 201 |
| 10 | 802 |
| 11 | 3343 |
| 12 | 14368 |
| 13 | 62909 |
| 14 | 282989 |
| 15 | 1299074 |
| 16 | 6111610 |
| 17 | 29330177 |
| 18 | 143869556 |
| 19 | 719339872 |
| 20 | 3669604633 |
| 21 | 19062972671 |
| 22 | 100880716332 |
| 23 | 543086732800 |
| 24 | 2974442015323 |
| 25 | 16556687511535 |
| 26 | 93655725178808 |
| 27 | 537951557765438 |
| 28 | 3137040309057826 |
| 29 | 18560431188723607 |