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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 45 |
| 7 | 100 |
| 8 | 222 |
| 9 | 488 |
| 10 | 1069 |
| 11 | 2324 |
| 12 | 5034 |
| 13 | 10840 |
| 14 | 23266 |
| 15 | 49704 |
| 16 | 105884 |
| 17 | 224720 |
| 18 | 475773 |
| 19 | 1004212 |
| 20 | 2115186 |
| 21 | 4443896 |
| 22 | 9319702 |
| 23 | 19503224 |
| 24 | 40750884 |
| 25 | 84990640 |
| 26 | 177017810 |
| 27 | 368108680 |
| 28 | 764571492 |
| 29 | 1585851248 |
| 30 | 3285861924 |
| 31 | 6800042704 |
| 32 | 14059397560 |
| 33 | 29037419424 |