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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 15 |
| 6 | 36 |
| 7 | 80 |
| 8 | 181 |
| 9 | 431 |
| 10 | 1060 |
| 11 | 2617 |
| 12 | 6401 |
| 13 | 15521 |
| 14 | 37513 |
| 15 | 90741 |
| 16 | 219918 |
| 17 | 533619 |
| 18 | 1295022 |
| 19 | 3141826 |
| 20 | 7619870 |
| 21 | 18478155 |
| 22 | 44810670 |
| 23 | 108676262 |
| 24 | 263576791 |
| 25 | 639267800 |
| 26 | 1550434777 |
| 27 | 3760269946 |
| 28 | 9119740067 |
| 29 | 22118021213 |
| 30 | 53642768716 |
| 31 | 130099857234 |
| 32 | 315531401964 |