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 | 46 |
| 7 | 106 |
| 8 | 247 |
| 9 | 578 |
| 10 | 1359 |
| 11 | 3204 |
| 12 | 7573 |
| 13 | 17930 |
| 14 | 42512 |
| 15 | 100902 |
| 16 | 239694 |
| 17 | 569768 |
| 18 | 1355083 |
| 19 | 3224124 |
| 20 | 7673612 |
| 21 | 18268414 |
| 22 | 43500301 |
| 23 | 103599089 |
| 24 | 246761629 |
| 25 | 587822094 |
| 26 | 1400398656 |
| 27 | 3336473471 |
| 28 | 7949650646 |
| 29 | 18942098721 |
| 30 | 45136103113 |
| 31 | 107555568419 |
| 32 | 256302098369 |