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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 25 |
| 7 | 67 |
| 8 | 184 |
| 9 | 519 |
| 10 | 1489 |
| 11 | 4342 |
| 12 | 12812 |
| 13 | 38207 |
| 14 | 114934 |
| 15 | 348397 |
| 16 | 1063050 |
| 17 | 3262588 |
| 18 | 10064645 |
| 19 | 31190985 |
| 20 | 97061431 |
| 21 | 303165207 |
| 22 | 950115502 |
| 23 | 2986817742 |
| 24 | 9415920424 |
| 25 | 29760442192 |
| 26 | 94286758293 |
| 27 | 299377379027 |
| 28 | 952521579944 |
| 29 | 3036380284111 |
| 30 | 9696325863803 |