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 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 3 |
| 7 | 8 |
| 8 | 20 |
| 9 | 48 |
| 10 | 112 |
| 11 | 255 |
| 12 | 571 |
| 13 | 1262 |
| 14 | 2760 |
| 15 | 5984 |
| 16 | 12880 |
| 17 | 27553 |
| 18 | 58631 |
| 19 | 124192 |
| 20 | 262008 |
| 21 | 550800 |
| 22 | 1154256 |
| 23 | 2412031 |
| 24 | 5027575 |
| 25 | 10455246 |
| 26 | 21697060 |
| 27 | 44940472 |
| 28 | 92920992 |
| 29 | 191818561 |
| 30 | 395386763 |
| 31 | 813872712 |
| 32 | 1673157228 |
| 33 | 3435591712 |
| 34 | 7046697888 |
| 35 | 14438448127 |
| 36 | 29555251315 |
| 37 | 60444113566 |