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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 9 |
| 10 | 56 |
| 11 | 333 |
| 12 | 2108 |
| 13 | 14724 |
| 14 | 117169 |
| 15 | 1074526 |
| 16 | 11249092 |
| 17 | 130484439 |
| 18 | 1612782351 |
| 19 | 20497233072 |
| 20 | 260975054461 |
| 21 | 3273854883027 |
| 22 | 40073904283055 |
| 23 | 476142523109291 |
| 24 | 5477680380616386 |
| 25 | 60959857679340812 |