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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 9 |
| 7 | 13 |
| 8 | 27 |
| 9 | 45 |
| 10 | 86 |
| 11 | 149 |
| 12 | 285 |
| 13 | 504 |
| 14 | 941 |
| 15 | 1710 |
| 16 | 3163 |
| 17 | 5768 |
| 18 | 10662 |
| 19 | 19513 |
| 20 | 35978 |
| 21 | 66026 |
| 22 | 121565 |
| 23 | 223317 |
| 24 | 411053 |
| 25 | 755480 |
| 26 | 1390042 |
| 27 | 2555802 |
| 28 | 4701713 |
| 29 | 8646064 |
| 30 | 15904390 |
| 31 | 29249425 |
| 32 | 53801243 |
| 33 | 98950246 |
| 34 | 182003370 |
| 35 | 334745794 |
| 36 | 615704412 |
| 37 | 1132436852 |
| 38 | 2082895617 |
| 39 | 3831006934 |