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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 31 |
| 7 | 79 |
| 8 | 211 |
| 9 | 564 |
| 10 | 1543 |
| 11 | 4259 |
| 12 | 11899 |
| 13 | 33526 |
| 14 | 95272 |
| 15 | 272544 |
| 16 | 784598 |
| 17 | 2270888 |
| 18 | 6604900 |
| 19 | 19293793 |
| 20 | 56581857 |
| 21 | 166523462 |
| 22 | 491674696 |
| 23 | 1455996925 |
| 24 | 4323328548 |
| 25 | 12869353254 |
| 26 | 38396655023 |
| 27 | 114803257039 |
| 28 | 343932660450 |
| 29 | 1032266513328 |
| 30 | 3103532577722 |