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 | 21 |
| 2 | 185 |
| 3 | 56 |
| 4 | 206 |
| 5 | 603 |
| 6 | 1247 |
| 7 | 2853 |
| 8 | 6870 |
| 9 | 15489 |
| 10 | 35924 |
| 11 | 84962 |
| 12 | 195967 |
| 13 | 453837 |
| 14 | 1061993 |
| 15 | 2464882 |
| 16 | 5719363 |
| 17 | 13329296 |
| 18 | 30988342 |
| 19 | 71989905 |
| 20 | 167525699 |
| 21 | 389592291 |
| 22 | 905597726 |
| 23 | 2106327411 |
| 24 | 4898465680 |
| 25 | 11389209332 |
| 26 | 26486000403 |
| 27 | 61593726193 |