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 | -2 |
| 4 | -4 |
| 5 | -4 |
| 6 | 1 |
| 7 | 15 |
| 8 | 43 |
| 9 | 91 |
| 10 | 166 |
| 11 | 276 |
| 12 | 430 |
| 13 | 638 |
| 14 | 911 |
| 15 | 1261 |
| 16 | 1701 |
| 17 | 2245 |
| 18 | 2908 |
| 19 | 3706 |
| 20 | 4656 |
| 21 | 5776 |
| 22 | 7085 |
| 23 | 8603 |
| 24 | 10351 |
| 25 | 12351 |
| 26 | 14626 |
| 27 | 17200 |
| 28 | 20098 |
| 29 | 23346 |
| 30 | 26971 |
| 31 | 31001 |
| 32 | 35465 |
| 33 | 40393 |
| 34 | 45816 |
| 35 | 51766 |
| 36 | 58276 |
| 37 | 65380 |
| 38 | 73113 |
| 39 | 81511 |
| 40 | 90611 |
| 41 | 100451 |
| 42 | 111070 |
| 43 | 122508 |