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) |
|---|---|
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 3 |
| 8 | 7 |
| 9 | 8 |
| 10 | 21 |
| 11 | 55 |
| 12 | 121 |
| 13 | 265 |
| 14 | 611 |
| 15 | 1379 |
| 16 | 3193 |
| 17 | 7436 |
| 18 | 17085 |
| 19 | 39339 |
| 20 | 91846 |
| 21 | 214549 |
| 22 | 500132 |
| 23 | 1169267 |
| 24 | 2743302 |
| 25 | 6445797 |
| 26 | 15167805 |
| 27 | 35749961 |
| 28 | 84390645 |
| 29 | 199523566 |
| 30 | 472429633 |
| 31 | 1120012481 |
| 32 | 2658525869 |
| 33 | 6318368820 |
| 34 | 15034189965 |
| 35 | 35811690663 |
| 36 | 85393261630 |