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) |
|---|---|
| 15 | 1430 |
| 16 | 4862 |
| 17 | 11934 |
| 18 | 25194 |
| 19 | 48450 |
| 20 | 87210 |
| 21 | 149226 |
| 22 | 245157 |
| 23 | 389367 |
| 24 | 600875 |
| 25 | 904475 |
| 26 | 1332045 |
| 27 | 1924065 |
| 28 | 2731365 |
| 29 | 3817125 |
| 30 | 5259150 |
| 31 | 7152444 |
| 32 | 9612108 |
| 33 | 12776588 |
| 34 | 16811300 |
| 35 | 21912660 |
| 36 | 28312548 |
| 37 | 36283236 |
| 38 | 46142811 |
| 39 | 58261125 |
| 40 | 73066305 |
| 41 | 91051857 |
| 42 | 112784399 |
| 43 | 138912059 |