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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 4 |
| 7 | 9 |
| 8 | 13 |
| 9 | 26 |
| 10 | 42 |
| 11 | 81 |
| 12 | 138 |
| 13 | 262 |
| 14 | 467 |
| 15 | 885 |
| 16 | 1620 |
| 17 | 3076 |
| 18 | 5743 |
| 19 | 10953 |
| 20 | 20721 |
| 21 | 39714 |
| 22 | 75873 |
| 23 | 146139 |
| 24 | 281259 |
| 25 | 544230 |
| 26 | 1053552 |
| 27 | 2047147 |
| 28 | 3981790 |
| 29 | 7766018 |
| 30 | 15165195 |
| 31 | 29676887 |
| 32 | 58148087 |
| 33 | 114129308 |
| 34 | 224278526 |
| 35 | 441368913 |
| 36 | 869583189 |
| 37 | 1715365690 |
| 38 | 3387344619 |