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 | 1 |
| 7 | 13 |
| 8 | 48 |
| 9 | 220 |
| 10 | 925 |
| 11 | 3895 |
| 12 | 16137 |
| 13 | 66399 |
| 14 | 271446 |
| 15 | 1101626 |
| 16 | 4442143 |
| 17 | 17822176 |
| 18 | 71191082 |
| 19 | 283269813 |
| 20 | 1123212251 |
| 21 | 4439583152 |
| 22 | 17496345670 |
| 23 | 68765995160 |
| 24 | 269595218881 |
| 25 | 1054499461385 |
| 26 | 4115767918639 |
| 27 | 16032123369549 |
| 28 | 62333852291879 |
| 29 | 241935803355457 |
| 30 | 937486479689517 |