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 | 5 |
| 2 | 210 |
| 3 | 3150 |
| 4 | 27556 |
| 5 | 170793 |
| 6 | 829920 |
| 7 | 3359356 |
| 8 | 11786190 |
| 9 | 36845718 |
| 10 | 104719524 |
| 11 | 274707420 |
| 12 | 672982128 |
| 13 | 1554007910 |
| 14 | 3407724936 |
| 15 | 7139933088 |
| 16 | 14366348780 |
| 17 | 27878652291 |
| 18 | 52364814150 |
| 19 | 95497666810 |
| 20 | 169546939380 |
| 21 | 293722986375 |
| 22 | 497527759560 |
| 23 | 825473130300 |
| 24 | 1343631834090 |