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 | 1 |
| 3 | 10 |
| 4 | 49 |
| 5 | 151 |
| 6 | 901 |
| 7 | 5881 |
| 8 | 28225 |
| 9 | 165565 |
| 10 | 1158601 |
| 11 | 6993196 |
| 12 | 44201521 |
| 13 | 320103070 |
| 14 | 2200745821 |
| 15 | 15118248601 |
| 16 | 113390231809 |
| 17 | 845797019077 |
| 18 | 6250243032145 |
| 19 | 48718551529210 |
| 20 | 384815404148401 |
| 21 | 3021055319338813 |
| 22 | 24492293678972725 |
| 23 | 202303201125303565 |
| 24 | 1669594463059152961 |