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 | 10 |
| 4 | 54 |
| 5 | 322 |
| 6 | 1294 |
| 7 | 4526 |
| 8 | 20782 |
| 9 | 93814 |
| 10 | 371110 |
| 11 | 1780294 |
| 12 | 6733918 |
| 13 | 22513642 |
| 14 | 92018398 |
| 15 | 461754862 |
| 16 | 1297077342 |
| 17 | 5790726826 |
| 18 | 32850248974 |
| 19 | 94597335398 |
| 20 | 454725608974 |
| 21 | 2080853077822 |
| 22 | 6173935052878 |
| 23 | 29922219241486 |
| 24 | 116844904688830 |
| 25 | 448338212337298 |
| 26 | 1975870364475334 |