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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 10 |
| 7 | 48 |
| 8 | 170 |
| 9 | 515 |
| 10 | 1471 |
| 11 | 4119 |
| 12 | 11605 |
| 13 | 32568 |
| 14 | 90756 |
| 15 | 250432 |
| 16 | 684816 |
| 17 | 1858440 |
| 18 | 5016359 |
| 19 | 13484339 |
| 20 | 36124302 |
| 21 | 96487740 |
| 22 | 257021991 |
| 23 | 682958487 |
| 24 | 1810749368 |
| 25 | 4791502490 |
| 26 | 12657090174 |
| 27 | 33383355375 |
| 28 | 87928909275 |
| 29 | 231312358250 |
| 30 | 607831534982 |
| 31 | 1595624166626 |