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) |
|---|---|
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 0 |
| 19 | 0 |
| 20 | 45 |
| 21 | 134 |
| 22 | 309 |
| 23 | 652 |
| 24 | 1323 |
| 25 | 2634 |
| 26 | 5193 |
| 27 | 10184 |
| 28 | 19911 |
| 29 | 38854 |
| 30 | 133040 |
| 31 | 412527 |
| 32 | 1241773 |
| 33 | 3701864 |
| 34 | 10999194 |
| 35 | 32642353 |
| 36 | 96825335 |
| 37 | 287134794 |
| 38 | 851344708 |
| 39 | 2523819059 |
| 40 | 10866247001 |
| 41 | 43994094066 |
| 42 | 175538023511 |
| 43 | 697843906028 |