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 | 5 |
| 2 | 15 |
| 3 | 35 |
| 4 | 70 |
| 5 | 125 |
| 6 | 200 |
| 7 | 275 |
| 8 | 275 |
| 9 | 0 |
| 10 | -999 |
| 11 | -3610 |
| 12 | -9380 |
| 13 | -20570 |
| 14 | -39440 |
| 15 | -65251 |
| 16 | -85695 |
| 17 | -56435 |
| 18 | 141735 |
| 19 | 781770 |
| 20 | 2413128 |
| 21 | 5999325 |
| 22 | 12921350 |
| 23 | 24387900 |
| 24 | 39098925 |
| 25 | 46638744 |
| 26 | 11740695 |
| 27 | -158571665 |
| 28 | -674961760 |
| 29 | -1956733020 |
| 30 | -4724183860 |
| 31 | -9957286550 |
| 32 | -18316004575 |