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 | 3 |
| 2 | 7 |
| 3 | 14 |
| 4 | 25 |
| 5 | 40 |
| 6 | 56 |
| 7 | 63 |
| 8 | 37 |
| 9 | -71 |
| 10 | -350 |
| 11 | -945 |
| 12 | -2064 |
| 13 | -3952 |
| 14 | -6783 |
| 15 | -10381 |
| 16 | -13625 |
| 17 | -13330 |
| 18 | -2359 |
| 19 | 33208 |
| 20 | 117672 |
| 21 | 288959 |
| 22 | 598325 |
| 23 | 1099385 |
| 24 | 1812546 |
| 25 | 2640543 |
| 26 | 3197152 |
| 27 | 2497824 |
| 28 | -1541375 |
| 29 | -12816925 |
| 30 | -37865849 |
| 31 | -86422322 |
| 32 | -170718343 |
| 33 | -301444536 |
| 34 | -476474600 |
| 35 | -655816385 |
| 36 | -713055419 |
| 37 | -351058887 |
| 38 | 1028750562 |
| 39 | 4501424879 |
| 40 | 11797832400 |
| 41 | 25361896880 |
| 42 | 47988600961 |