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 | 16 |
| 3 | 81 |
| 4 | 265 |
| 5 | 729 |
| 6 | 1786 |
| 7 | 4060 |
| 8 | 8833 |
| 9 | 18786 |
| 10 | 39586 |
| 11 | 83273 |
| 12 | 175463 |
| 13 | 370615 |
| 14 | 784290 |
| 15 | 1661122 |
| 16 | 3517669 |
| 17 | 7441936 |
| 18 | 15720066 |
| 19 | 33145015 |
| 20 | 69744491 |
| 21 | 146458013 |
| 22 | 306933394 |
| 23 | 642004440 |
| 24 | 1340415817 |
| 25 | 2793811726 |
| 26 | 5813791138 |
| 27 | 12080174037 |
| 28 | 25065845455 |
| 29 | 51943066643 |
| 30 | 107509343618 |
| 31 | 222265656670 |
| 32 | 459025904205 |
| 33 | 947041760092 |
| 34 | 1952064327682 |