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) |
|---|---|
| 0 | 13 |
| 1 | 34 |
| 2 | 81 |
| 3 | 170 |
| 4 | 340 |
| 5 | 654 |
| 6 | 1227 |
| 7 | 2258 |
| 8 | 4095 |
| 9 | 7340 |
| 10 | 13032 |
| 11 | 22956 |
| 12 | 40169 |
| 13 | 69890 |
| 14 | 121005 |
| 15 | 208606 |
| 16 | 358268 |
| 17 | 613242 |
| 18 | 1046535 |
| 19 | 1781170 |
| 20 | 3024123 |
| 21 | 5123104 |
| 22 | 8661456 |
| 23 | 14616600 |
| 24 | 24624325 |
| 25 | 41419234 |
| 26 | 69568137 |
| 27 | 116690258 |