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 | 7 |
| 4 | 33 |
| 5 | 103 |
| 6 | 258 |
| 7 | 559 |
| 8 | 1091 |
| 9 | 1967 |
| 10 | 3332 |
| 11 | 5367 |
| 12 | 8293 |
| 13 | 12375 |
| 14 | 17926 |
| 15 | 25311 |
| 16 | 34951 |
| 17 | 47327 |
| 18 | 62984 |
| 19 | 82535 |
| 20 | 106665 |
| 21 | 136135 |
| 22 | 171786 |
| 23 | 214543 |
| 24 | 265419 |
| 25 | 325519 |
| 26 | 396044 |
| 27 | 478295 |
| 28 | 573677 |
| 29 | 683703 |
| 30 | 809998 |
| 31 | 954303 |
| 32 | 1118479 |
| 33 | 1304511 |
| 34 | 1514512 |
| 35 | 1750727 |
| 36 | 2015537 |
| 37 | 2311463 |
| 38 | 2641170 |
| 39 | 3007471 |
| 40 | 3413331 |