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 | 55 |
| 2 | 505 |
| 3 | 1001 |
| 4 | 1221 |
| 5 | 2121 |
| 6 | 5041 |
| 7 | 5051 |
| 8 | 5501 |
| 9 | 10101 |
| 10 | 12001 |
| 11 | 15225 |
| 12 | 20301 |
| 13 | 21021 |
| 14 | 23501 |
| 15 | 24301 |
| 16 | 24341 |
| 17 | 30041 |
| 18 | 31031 |
| 19 | 32451 |
| 20 | 42241 |
| 21 | 50125 |
| 22 | 50321 |
| 23 | 101101 |
| 24 | 102421 |
| 25 | 105131 |
| 26 | 111111 |
| 27 | 113425 |
| 28 | 121001 |
| 29 | 121101 |
| 30 | 123041 |
| 31 | 123321 |
| 32 | 132305 |
| 33 | 150135 |
| 34 | 152021 |
| 35 | 201201 |
| 36 | 204445 |
| 37 | 212121 |
| 38 | 221001 |
| 39 | 222401 |
| 40 | 232401 |