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 | 6 |
| 3 | 27 |
| 4 | 92 |
| 5 | 323 |
| 6 | 1070 |
| 7 | 3527 |
| 8 | 11314 |
| 9 | 35708 |
| 10 | 110478 |
| 11 | 336629 |
| 12 | 1011097 |
| 13 | 2997233 |
| 14 | 8778761 |
| 15 | 25424358 |
| 16 | 72867447 |
| 17 | 206804742 |
| 18 | 581573340 |
| 19 | 1621407554 |
| 20 | 4483701126 |
| 21 | 12303384015 |
| 22 | 33514076529 |
| 23 | 90656680725 |
| 24 | 243603875523 |
| 25 | 650444927010 |
| 26 | 1726229294595 |
| 27 | 4554686670838 |
| 28 | 11950683658941 |