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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 9 |
| 6 | 45 |
| 7 | 166 |
| 8 | 505 |
| 9 | 1341 |
| 10 | 3223 |
| 11 | 7149 |
| 12 | 14916 |
| 13 | 29480 |
| 14 | 55902 |
| 15 | 101892 |
| 16 | 180245 |
| 17 | 309297 |
| 18 | 518859 |
| 19 | 849563 |
| 20 | 1366441 |
| 21 | 2154789 |
| 22 | 3348972 |
| 23 | 5119981 |
| 24 | 7733835 |
| 25 | 11520100 |
| 26 | 16985374 |
| 27 | 24746334 |
| 28 | 35735413 |
| 29 | 51073008 |
| 30 | 72432093 |
| 31 | 101794713 |
| 32 | 142085314 |
| 33 | 196744665 |
| 34 | 270764547 |