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 | -9 |
| 1 | -47 |
| 2 | -105 |
| 3 | -295 |
| 4 | -753 |
| 5 | -1991 |
| 6 | -5193 |
| 7 | -13615 |
| 8 | -35625 |
| 9 | -93287 |
| 10 | -244209 |
| 11 | -639367 |
| 12 | -1673865 |
| 13 | -4382255 |
| 14 | -11472873 |
| 15 | -30036391 |
| 16 | -78636273 |
| 17 | -205872455 |
| 18 | -538981065 |
| 19 | -1411070767 |
| 20 | -3694231209 |
| 21 | -9671622887 |
| 22 | -25320637425 |
| 23 | -66290289415 |
| 24 | -173550230793 |
| 25 | -454360402991 |