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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 14 |
| 6 | 175 |
| 7 | 2330 |
| 8 | 34300 |
| 9 | 561386 |
| 10 | 10179309 |
| 11 | 203240850 |
| 12 | 4439192835 |
| 13 | 105413331100 |
| 14 | 2705921548616 |
| 15 | 74703337429084 |
| 16 | 2207904948683525 |
| 17 | 69575538504102190 |
| 18 | 2329022305536291275 |
| 19 | 82546355086989894366 |
| 20 | 3088417981826529182964 |
| 21 | 121651432581579519835950 |
| 22 | 5032424258902838518567945 |