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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 47 |
| 7 | 111 |
| 8 | 267 |
| 9 | 646 |
| 10 | 1582 |
| 11 | 3892 |
| 12 | 9636 |
| 13 | 23961 |
| 14 | 59871 |
| 15 | 150128 |
| 16 | 377738 |
| 17 | 953029 |
| 18 | 2410626 |
| 19 | 6111055 |
| 20 | 15524013 |
| 21 | 39508683 |
| 22 | 100719223 |
| 23 | 257150952 |
| 24 | 657454544 |
| 25 | 1683042629 |
| 26 | 4313582090 |
| 27 | 11067748352 |
| 28 | 28426813910 |
| 29 | 73082880708 |
| 30 | 188059428289 |
| 31 | 484330230117 |
| 32 | 1248338233493 |