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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 14 |
| 6 | 43 |
| 7 | 81 |
| 8 | 272 |
| 9 | 538 |
| 10 | 1920 |
| 11 | 3926 |
| 12 | 14649 |
| 13 | 30694 |
| 14 | 118489 |
| 15 | 252939 |
| 16 | 1002994 |
| 17 | 2172830 |
| 18 | 8805410 |
| 19 | 19304190 |
| 20 | 79648888 |
| 21 | 176343390 |
| 22 | 738665040 |
| 23 | 1649008456 |
| 24 | 6996865599 |
| 25 | 15730575554 |
| 26 | 67491558466 |
| 27 | 152663683494 |
| 28 | 661370687363 |
| 29 | 1503962954930 |
| 30 | 6571177867129 |