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) |
|---|---|
| 5 | 1 |
| 6 | 5 |
| 7 | 24 |
| 8 | 104 |
| 9 | 438 |
| 10 | 1796 |
| 11 | 7238 |
| 12 | 28848 |
| 13 | 113518 |
| 14 | 444278 |
| 15 | 1720384 |
| 16 | 6643492 |
| 17 | 25421620 |
| 18 | 97136712 |
| 19 | 368280210 |
| 20 | 1395104236 |
| 21 | 5250325378 |
| 22 | 19746342212 |
| 23 | 73863421894 |
| 24 | 276113486146 |
| 25 | 1027609657470 |
| 26 | 3821478801772 |
| 27 | 14161346139866 |
| 28 | 52428406903688 |
| 29 | 193568833452364 |
| 30 | 713860635606784 |