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 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 24 |
| 5 | 68 |
| 6 | 144 |
| 7 | 388 |
| 8 | 856 |
| 9 | 2228 |
| 10 | 5056 |
| 11 | 12852 |
| 12 | 29736 |
| 13 | 74372 |
| 14 | 174384 |
| 15 | 431332 |
| 16 | 1020664 |
| 17 | 2505428 |
| 18 | 5965984 |
| 19 | 14568468 |
| 20 | 34840776 |
| 21 | 84774308 |
| 22 | 203340816 |
| 23 | 493553092 |
| 24 | 1186252696 |
| 25 | 2874447092 |
| 26 | 6918369664 |
| 27 | 16744740852 |
| 28 | 40340742504 |
| 29 | 97560443588 |