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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 4 |
| 8 | 6 |
| 9 | 13 |
| 10 | 24 |
| 11 | 48 |
| 12 | 85 |
| 13 | 160 |
| 14 | 288 |
| 15 | 541 |
| 16 | 1008 |
| 17 | 1920 |
| 18 | 3626 |
| 19 | 6912 |
| 20 | 13107 |
| 21 | 24989 |
| 22 | 47616 |
| 23 | 91136 |
| 24 | 174590 |
| 25 | 335462 |
| 26 | 645120 |
| 27 | 1242904 |
| 28 | 2396745 |
| 29 | 4628480 |
| 30 | 8947294 |
| 31 | 17317888 |
| 32 | 33552384 |
| 33 | 65074253 |
| 34 | 126320640 |
| 35 | 245428574 |
| 36 | 477218560 |
| 37 | 928645120 |
| 38 | 1808400384 |
| 39 | 3524068955 |