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 | 3 |
| 3 | 12 |
| 4 | 35 |
| 5 | 92 |
| 6 | 228 |
| 7 | 544 |
| 8 | 1264 |
| 9 | 2880 |
| 10 | 6464 |
| 11 | 14336 |
| 12 | 31488 |
| 13 | 68608 |
| 14 | 148480 |
| 15 | 319488 |
| 16 | 684032 |
| 17 | 1458176 |
| 18 | 3096576 |
| 19 | 6553600 |
| 20 | 13828096 |
| 21 | 29097984 |
| 22 | 61079552 |
| 23 | 127926272 |
| 24 | 267386880 |
| 25 | 557842432 |
| 26 | 1161822208 |
| 27 | 2415919104 |
| 28 | 5016387584 |
| 29 | 10401873920 |
| 30 | 21541945344 |
| 31 | 44560285696 |
| 32 | 92073361408 |
| 33 | 190052302848 |
| 34 | 391915765760 |