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) |
|---|---|
| 4 | 1 |
| 5 | 12 |
| 6 | 103 |
| 7 | 811 |
| 8 | 6273 |
| 9 | 48806 |
| 10 | 386041 |
| 11 | 3122069 |
| 12 | 25900188 |
| 13 | 220791812 |
| 14 | 1935811756 |
| 15 | 17461471292 |
| 16 | 162038542377 |
| 17 | 1546528485770 |
| 18 | 15174625184321 |
| 19 | 152994813139537 |
| 20 | 1584120732683571 |
| 21 | 16834244135840106 |
| 22 | 183496533502593453 |
| 23 | 2050337555698723711 |
| 24 | 23470542944212951050 |