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 | 3 |
| 2 | 6 |
| 3 | 11 |
| 4 | 20 |
| 5 | 37 |
| 6 | 66 |
| 7 | 117 |
| 8 | 208 |
| 9 | 371 |
| 10 | 662 |
| 11 | 1179 |
| 12 | 2100 |
| 13 | 3741 |
| 14 | 6666 |
| 15 | 11877 |
| 16 | 21160 |
| 17 | 37699 |
| 18 | 67166 |
| 19 | 119667 |
| 20 | 213204 |
| 21 | 379853 |
| 22 | 676762 |
| 23 | 1205749 |
| 24 | 2148216 |
| 25 | 3827355 |
| 26 | 6818982 |
| 27 | 12148995 |
| 28 | 21645180 |
| 29 | 38563997 |
| 30 | 68707298 |
| 31 | 122411917 |
| 32 | 218094408 |
| 33 | 388566507 |
| 34 | 692287030 |
| 35 | 1233408755 |
| 36 | 2197494812 |
| 37 | 3915152565 |
| 38 | 6975406506 |
| 39 | 12427688349 |