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 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 27 |
| 5 | 75 |
| 6 | 157 |
| 7 | 437 |
| 8 | 915 |
| 9 | 2547 |
| 10 | 5333 |
| 11 | 14845 |
| 12 | 31083 |
| 13 | 86523 |
| 14 | 181165 |
| 15 | 504293 |
| 16 | 1055907 |
| 17 | 2939235 |
| 18 | 6154277 |
| 19 | 17131117 |
| 20 | 35869755 |
| 21 | 99847467 |
| 22 | 209064253 |
| 23 | 581953685 |
| 24 | 1218515763 |
| 25 | 3391874643 |
| 26 | 7102030325 |
| 27 | 19769294173 |
| 28 | 41393666187 |
| 29 | 115223890395 |
| 30 | 241259966797 |
| 31 | 671574048197 |