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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 2 |
| 7 | 5 |
| 8 | 8 |
| 9 | 13 |
| 10 | 20 |
| 11 | 38 |
| 12 | 68 |
| 13 | 118 |
| 14 | 206 |
| 15 | 380 |
| 16 | 692 |
| 17 | 1262 |
| 18 | 2306 |
| 19 | 4277 |
| 20 | 7930 |
| 21 | 14745 |
| 22 | 27492 |
| 23 | 51541 |
| 24 | 96792 |
| 25 | 182182 |
| 26 | 343670 |
| 27 | 650095 |
| 28 | 1231932 |
| 29 | 2338706 |
| 30 | 4447510 |
| 31 | 8472697 |
| 32 | 16164914 |
| 33 | 30884150 |
| 34 | 59086618 |
| 35 | 113189168 |
| 36 | 217091832 |
| 37 | 416839177 |
| 38 | 801247614 |
| 39 | 1541726967 |
| 40 | 2969432270 |