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 | 2 |
| 2 | 4 |
| 3 | 16 |
| 4 | 26 |
| 5 | 94 |
| 6 | 152 |
| 7 | 548 |
| 8 | 886 |
| 9 | 3194 |
| 10 | 5164 |
| 11 | 18616 |
| 12 | 30098 |
| 13 | 108502 |
| 14 | 175424 |
| 15 | 632396 |
| 16 | 1022446 |
| 17 | 3685874 |
| 18 | 5959252 |
| 19 | 21482848 |
| 20 | 34733066 |
| 21 | 125211214 |
| 22 | 202439144 |
| 23 | 729784436 |
| 24 | 1179901798 |
| 25 | 4253495402 |
| 26 | 6876971644 |
| 27 | 24791187976 |
| 28 | 40081928066 |
| 29 | 144493632454 |
| 30 | 233614596752 |